Reddit went from building communities to chasing monies. They butchered API access which caused a two day Reddit blackout that thousands of subreddits supported. Mind you, some even closed their subs permanently. Then they removed the awards system which was a fun way for users to upvote and reward great content. To add insult to injury, they introduced what they called a "Contributor program" aka a KYC cash grab (only available in the US), then the final nail in the coffin was the removal of the Community Points system yesterday.
I can vouch for everything up until the contributor program, I must have dipped before that. I just kept my explanation quick and dirty to get the point across