Hmm, well, I'm gonna point out everything I do regardless if I fall into doom scrolling areas.
Use Sync for Reddit and Lemmy most of the time.
Use a bit of Feeder and Feedly for different kinds of news.
Facebook for memes and local shit.
Telegram to chat with my girlfriend and closer friends also to discuss a lot of custom ROM groups for my device, Poco F2 Pro (lmi), and several other groups, I think Telegram always takes the most usage time.
Firefox for random searches.
Showly/Trakt for marking as watched the shows/animes I'm watching also read some comments to see other opinions, for anime I usually head up to MAL, the website because the app sucks.
Discord to arrange Jump Ultimate Stars matches.
WhatsApp to chat with family or users who haven't ascended
Spotify when I'm on my old car, plugged in the jack port.
Pocket Casts with the earphones when I'm doing some activities that doesn't require me to think hard (somehow I can't concentrate with them when I'm on the car, especially if they are in English, which ain't my native language).
Todoist, Task.org/Google Tasks and Google Keep to write down some shit, I also use Evernote, but I really don't enjoy the experience of it in Android, in fact I have never liked the mobile app.
I take some cat pictures and minimal YT usage as most of my usage is done from the Shield TV, which is a lot...
Gaming, just when I need to pass some time in the dumbest way possible (?) I don't like Android gaming, despite acknowledging that there are some true gems there, I'd take any of my handhelds before it though, just to mention a few, Miyoo Mini V2, Anbernic RG351V, Nintendo DS, Nintendo Switch, PSP or Vita, I love handhelds and for me mobile phones never replaced them.
As you can see I use my smartphone in a medium usage (because no gaming or any kind of heavy processing) and with a good ROM I almost hit about two days of uptime and 6-8 hrs of SOT, so that's good enough for me.
I think I would use it a bit less if I had my MacBook back, but it is not working at the moment so yeah, pretty much all my internet usage is done from here... And many users do the same (because they don't even have any form of PC to begin with).