Seeing the assumption that all of the people suggesting the tag/block option as a better scenario MUST be a case of "i can do whatever i want you cant stop it! your oc belongs to ME!" or "the internet is free range get over your discomfort and get used to it lolll" I shrivel like a raisin in the sun.
The idea that no one cares about the real people involved also keeps being expressed on both ends, with different priority on who "the real person being harmed" is, which is also frustrating to watch.
With that in mind, the option to me, that I think keeps everyone safest, and thus why I am for it, regardless of fan or creator status, is the use of clear tagging and blocking, to prevent anyone from being exposed to things they do not want to see, and to prevent anyone ""deserving"" or not, from being hunted down with malicious intent.
If you are a creator, you should not have to be forced to see what makes you uncomfortable. That is the end of the sentence. There is no following call to arms of "so hunt down anyone who makes it Wrong and report back." attached. No. You shouldn't have to see it, so people should take steps to not show it to you, and you should also be taking steps to not find it. It should not show up near you, because you are the one effected by it, that does not mean it should never show up anywhere ever for anyone.
Boundaries, for anyone, is when you state a line and what YOU will do for YOU when it is crossed. Boundaries are to keep YOU safe. It is not laying down a line and saying anyone who steps on it when you're not even in the room should be shot. You cannot inflict boundaries on another person, that is called a rule.
And at the end of the day, a large chunk of what "boundaries" in mcyt are enforced for, and I'm not saying every single one that's ever been done is this way, largely come down to personal preference, not fundamentally harmful or inappropriate things on their own.
It could just be me as an artist, long time blogger, or just a human being that exists nervously under other peoples eyes, but Ive long been well aware that how people read you, actions you take, and the things you create, will be experienced and interacted with differently than how you want or intend them to come across.
Any time I put my own words or characters out for other people to see, I am aware that they are not going to be viewing it with the same lens or intent that I have. There are things I would not want to see made, and that is the part where I ask not to see it or they will be blocked, not start a crusade to sniff out "the traitors" to have every instance of what I do not like reported to me.
That is creating more harm than it is ending, and solving no one's problems.
In one instance I am safe from anything unpleasant to my tastes and another person is left to their own devices unharmed, the other I am repeatedly distressed and strangers are encouraged to enforce their own justice in my name.
Just as much that you cant control what people do and how they will perceive your creations, you cant control what people will say and do in defense of those rule lines you have laid as enforceable for those creations.
I have seen too much paranoia, obsession, and death threats in all fandoms of all ages to trust groups of strangers to be the gavel to strike each other down fairly in any capacity.
If your requirement is do not think about it, do not say it even in private, do not imply it, no matter what even if I am not there or involved with where it takes place, or else i will inflict it on myself and hunt you down for it- I really hope I do not have to clarify that is neither a good or lastingly functional mindset to impose on yourself or anyone else, in any context, nor is it one that has ever worked well or safely.
I am not saying this because I think fans have an entitlement to anything they want from a creator, I am saying this because the framework you are trying to use does not and cannot function or hold up with the intent of what you want to happen in the reality we stand in.