Yes indeed, and that's not taking into account the mental strain of dealing with all of those people!
LuLa is apparently one of the better places in which to browse, and it doesn't take long to realise that even here, on this little island of semi-sanity, there are folks who feel obliged to switch off other folks!
Imagine the life one would lead having to try and be all things to all men! I say 'men' because I imagine that women, in general, have better ways of spending their time than in a world of fantasy.
You are right: trying to be all things to all men is impossible. Fortunately, Instagram or blogs have a built-in asymmetry: there is the poster and the followers. The followers cannot really disagree.
Take the example of Ming Thein. The blog presents him as a printing guru. Would you go to this blog and post comments that his claims of "super resolution" are, at best, unfounded? Or even post comments that you also know how to run a printer? That would be futile, you would be torn to pieces by all the other followers who came to read the words of the guru.
So being in that position is probably not very tiring once you have enough followers, because nobody can really disagree with you.