I don’t think that word means what you think it means:

“…then they degrade those offerings to better serve business customers, and finally degrade their services to users and business customers to maximize profits for shareholders.“ (https://en.wikipedia.org/wiki/Enshittification)

Ycombinator is not degrading the quality of this forum. You’re unhappy with the qualities of posts from free user participation (which is everybody; no premium paid tier users). Totally different situations.