I don't think it's actually hard to understand how prominent figures in the Church appearing on platforms or allowing others to appear on their platforms without challenging them can be bad and dangerous, but so many people seem to have trouble with it

If a prominent Catholic (say, a Bishop) appears on a platform (say, a YouTube channel) and does or says nothing to challenge that platform, then their appearance, intended or not, serves as an endorsement.

Many people will go to that platform to hear what the Catholic figure has to say. and then they will very likely begin exploring other things on that platform, often uncritically. and then you've helped lead them to some pretty awful stuff.

Alternatively, when you have a terrible person on your platform, even if their specific appearance is itself fine, you expose them to your audience, many of whom who, again, go and check out more of their stuff, and then be exposed to their terrible ideas.

When you are a prominent figure or a major platform, you have a responsibility to be much more critical in your investigation of these things. You can't just shrug and say "oh, well what they said here was fine, we're not responsible for what they've said elsewhere"

You are either abdicating this responsibility, which you should rightly be criticized for, or you are actually okay with whatever it is you're endorsing, in which case you should also be criticized.