This is the kind of question that would compel the grandparent to feel the way they do. Although, to me, it may be a bit of hyperbole. Or maybe some not completely unjustified paranoia.

If we observe an example where we a step back from the severity of judicial repercussions of a post or comment and look at it socially. We could use the "cancel culture" ideology; where you could write something naively and be ambushed by a group that thinks your thoughts are wrong.

I am also assuming Grandparent is in a western country. There are other parts of the world where you could have contributed to an online community and later have whatever subject it was about outlawed. Thus exemplifying gp's idea.

And on a side note I felt cringey writing my response. Whatever that means.