And as a bonus : possibility to keep music videos playing while changing app. (A parameter has to be switched for that though)
With brave you can uninstall the native Reddit app and just use the webapp instead, without ads and stupid-ass "It's better in the app!" or "instead of taking a screenshot, use the share button!" messages.
Off-topic but damn how shitty of them to add their own watermark when you download an image from a post, and then they dare to say "Better to use the share button!" if you take a screenshot of it instead.
Regarding playing music videos (I guess you’re referring to YouTube), while the playback pauses when you switch away from Safari or lock the phone, you can unpause it via Control Center while in an other app, or on the lock screen.