There's been no statement that they plan to fix it, and a lot of games do move from itch to other platforms (mostly Steam) and force users onto them. I make a point of only buying games which are playable through itch, and not until I've made sure the devs plan to maintain support for the itch.io version - which seemed safe with Among Us because it's been running fine on here for years already.
Contact support about the issue, the more people that do, the more likely they are to actually treat it as a problem. I'm one of a number of buyers on itch.io who don't have the option of using Steam (Valve has known their client is a health risk for some users for over 18 months and refuse to address the problem).