Well, disregarding all the virtue signaling we do see this kind of behavior in the otaku (for the lack of a better word) fandom. Western fujoshi sent death threats to the Tokyo Ghoul author to make their yaoi headcanon official, people from /v/ were spamming Kitaeri with pictures of their dicks on social media etc etc.
What I think is the core issue here isn't toxicity or anything like that but a lack of self-insight. It'd be one thing if you were actually commissioning or contributing to the scanlators/fansubbers since then you'd naturally have an interest in getting your money's worth and have some actual say, but when you're basically a leeching without contributing (which isn't a problem in and of itself) you have very little ground to make demands on. Scanlators aren't obligated to give you anything just like you aren't obligated to give them anything whether it be attention or funding, it's an entirely voluntary relationship.
It's completely fine to levy some constructive criticism even as an outsider, but people on the internet who demand things of others and attack them for not conforming to their personal beliefs (which we see plenty of in current year) are nothing but entitled brats and needs to be shamed as such.