• Your Device's Internet Protocol address (e.g. IP address), - absolutely necessary for anti-ddos techniques
• browser type, browser version, - necessary for UX to build a functional website for the browsers that customers actually use
• the pages of our Service that You visit, the time and date of Your visit, the time spent on those pages, - critical for determining what is popular and what isn't to improve how the interface is designed and what parts are pulled forward and what parts are hidden in menus
• unique device identifiers and other diagnostic data. - useful for determining how often you switch devices and the performance and other experience metrics to drive making the app more user friendly

I work on web software professionally and this is a pretty minimal list that is completely justifiable for maintaining operations. If you can't answer basic questions like "what are users doing with the app?", you can't make intelligent decisions about how to improve it.

There's a lot of the same stuff here: https://legal.lemmy.world/privacy-policy/

I don't know anything about this app or company so I'm not going to defend them, but there aren't any real red flags here. If this amount of data collection bothers you, you really should stop using the internet in general.