reasons why (in my opinion) the try guys hit the nail on the head with forming a subscription service where watcher fumbled:
try guys has already been making TV-caliber content for a while. without a recipe and phoning it in both feel like professional cooking shows, and the fact that they have actual celebrity guests adds to that. their audience is extremely familiar with them having this huge set and a ton of employees working to produce the videos they love. on top of that, they've been around longer. they mention at the beginning of the announcement they've been on YouTube for ten years, & dropout/CH similarly had been around for a while when it's streaming service dropped. try guys just always felt more professional & as a fan you immediately understand why they would need more money
(edit) also, they have formed an emotional connection between the audience and their employees! people love rachel & know how hard she works & want to see her get paid well for that work. not that the watcher team don't deserve that, but their audience is way less emotionally invested in their employees' wellbeings than with the try guys audience & their non-talent team (& I say this as a fan & regular viewer of both channels).
try guys already had experience with paid content that went over really well with their audience. their live shows proved that their audience was willing to pay a decent amount every once in a while for something cool, and they proved that they would actually provide something cool for that money. people pointed out how watcher neglected their patreon; the try guys made very good use of their live shows imo. and as a result, they are able to say "you'll get free tickets to the live shows!" which is a really good perk if you are someone who enjoys those. instead of paying $20 every once in a while for one live show, you can pay 5$ for free live shows and early content and exclusive new content.
plus, they also reveal their expanded cast, which is something all of their fans have been wondering about for over a year. it's not just keith and zach you get to see, but all of these people their audience now loves and is always talking about wanting to join the try guys officially. collectively the try guys announcement feels more positive in multiple senses, both in emotional vibe and in what the audience is getting out of this.
also: no one can say for certain whether or not they decided to keep posting on YT after the watcher debacle, but I'm gonna give them the benefit of the doubt & believe that they always intended to stay on YouTube. it makes sense as a business decision & it's clear they've been working on this for some time (despite what some people seem to think??). tbh I don't think they were trying to be cruel to watcher in their announcement, I think they just saw that shitstorm and understood they needed to make it clear to their audience that they are not making the same mistakes. EDIT: in the most recent trypod, zach confirmed that they have been planning to 1) create a streaming service 2) keep posting content free on YouTube since 2023. so, no, they did not create 2nd Try or decide to stay on YouTube because of Watcher. stop trying to manufacture drama.
also also: they have, especially in the trypod, been very candid about their struggles with the algorithm and appealing to youtube's demands for content. in one episode I remember them talking about how they wanted to reject the "constant expansion" mindset, placing more focus on what their existing audience wants rather than trying to constantly get new people. they have been open about how certain things they want to do are not viable because of monetization issues; smoke show is a recent example of this.
another edit: also in the recent episode of the trypod, Zach says that they reached out to Sam Reich of Dropout for tips on starting a streaming service & things to avoid. we have no way of telling if Watcher did this, but I wouldn't be surprised if that was also key in why they turned out differently.
tl;dr i think it comes down to what was presented (not leaving youtube, new content that wouldn't be allowed on youtube, free live shows, new cast), how it was presented (shorter video, focus on the excitement & positives, show of respect to those who can't afford the price), and the context surrounding it (being older, a reputation for more professional content, having prepared their audience for a big shift, having previously discussed issues with youtube and their content)