I'd say it goes deeper than that. the lack of a proper mobile app has definitely decreased my presence on reddit. but there's more.

i do visit some 'niche' subreddits about once a day from my desktop (hurrah for old.reddit), and i once went to popular+hot -- it was utter rubbish. being here and on mastodon has opened my eyes on how severely the general content on reddit has deteriorated.

My honest reaction to that information

Not only that.. But the hell would want to buy Reddit awards anymore?

The figure is probably closer to 40% than 90%, subredditstats seems to be affected by the api changes too. However 40% at the low end of the range is still phenomenally bad. And every subreddit is definitely seeing a constantly declining amount of activity now.

I just can't bring myself to use it anymore. It just makes me so sad and disgusted. I used to browse daily. I feel bad for the people still on there seemingly unaware how much they are being taken advantage of and how little the platform cares for them.

It was pretty obvious from looking at /r/all that upvotes and comments are way down. Posts from somewhat obscure subreddits are making it to the front page, something you never saw before. People may be reading, but they're not participating as much as before.

YouTube is strong because it has an evergreen library. Reddit relies on the present. That makes it much easier to change platform.