Did you mean computers are a bad choice for regular users?
Something something touch grass. Bugs exist in all OSs. If my data sold & being advertized + tracked by a US-based company’s closed-source OS is the alternative, then I am just turning off the computer & starting a farm.
I would just add a +1 for Sony Xperia phones with LineageOS support (do check). They offer OLED panels, a 3.5mm headphone jack, & microSD card—with the last two once being standard now almost impossible to find despite their usefulness.
As for services, many of them can be accessed thru a browser. There are enough Firefox forks out there that you could stay authenticated with these grimy, untrustworthy apps & another fork with your typical web browsing.
That said some of this could be given up to an extent. If you have a microSD slot or carry a separate DAP, there shouldn’t be much need for Spotify where an offline library is quicker, saves data, & can offer higher bitrates (obv no ads too). Microsoft GitHub is not useful on a phone since no one codes on a phone & you can subscribe to the things you need either their Atom feeds or via email & all of your personal code should be living somewhere off the proprietary platform—especially if you want to help access to contributions since it is blocked for US sactions in some regions & they bow out to capitalist interests (see youtube-dl, or Switch emulators, etc.), while requiring your contributors give up their privacy as there is no way to report bugs or send patches without an account. And the chat options, depending on the situation you should see if you can get folks to consider your privacy too (else why on this sub?) & switch to something decentralized & with E2EE the default for DMs & optional for groups—XMPP is a great default choice, Mumble was built for games, but there are other options. Need is a strong word, & it might take a few years, but eventually, hopefully you can ween yourself & help friends get off these platforms as it is bad for them too, but you are not going to get much privacy if the corporations & governments can still read all your chats.