I think what might help the whole "low engagement in fandom spaces driving creatives out because they don't see the point in sharing anything only to get crickets or critics" is not the shaming tone of "look this is how you get nothing, you entitled shits" that tends to be very pervasive, but rather pointing out how actually rewarding it can be to leave nice comments.
I like to leave very long rambling comments on people's fics and that has actually netted me some very real, genuine friendships and we've become cheerleaders for each other. My friend has a D&D Podcast that she doesn't get ANY sort of engagement out of, so I started listening to it at work and livereacting the things I enjoy about it and showing her my investment and it makes her very happy and it makes me happy that she's happy.
Being nice to people... is actually a good enough reason to do things, shockingly enough. You don't have to do it. No one should shame you for not doing it. But it doesn't actually cost anything to make other people happy, especially if they created something that made you happy.














