I don't really notice anything on Tapastic. Frankly, I barely get comments here but I swear to god, people on Line, as much as I use the site, act like they have some kind of right. While not all these comments have been on mine, I've certainly seen them through many different series.
"Your updates are too short."
"Your art needs to get better"
"Shipping Comment."
I'll make my work as long or as short as I want it to be. You aren't the artist here, I am and I'll draw it however I want. And as far as the last one, well you're lucky an iceberg hasn't hit yet. The last one's more personal but it always feel that people care more for their precious relationship than the actual story and development in the series.
Quite honestly, Line's gotten really annoying with it, and since there's almost no way to really get any control over it, there's not much you can do. The random "Report" button only goes so far.
At least with Tapastic, comments can't hide behind a state of anonymity. .