every software
while games can be classified as software, i make a serious distinction between most software and most games.
most games on itch are single time encounters. download. play. move on. it is rare to immediatly download a new update, even if it comes out monthly or even weekly. i can update it, when i feel like playing it again. no need for any update companion scheduler. there are only so many games I could "really" follow, like installing an update when it comes out.
and if you have an account for some webservice, you are prime target for hacking.
but the bottom line for me is, i do not even trust bigger companies to manage an update service, so i absolutly do not trust a single dev with it, and to make it worse, in most cases i do not see the need for such a service to begin with - not for the type of content we are talking about.
to put into another perspective, from what i saw on itch so far, game devs do not even bother to make their games installable. rightly so, because it is not needed. unzip and you are done. in ye olden days thsi would have been called portable. the olden days where itsy bitsy tool devs had installation routines, routinly bundled with adware and leftovers when you deinstalled. I saw about once a game with some kind of "companion" app. Maybe twice. And it was basically to ensure some kind of drm by way of a launcher/updater. (still talking about offline indie games)