I use piped/newpipe etc. and simply support creators i watch via patreon/direct donations/merch. Less money for shitty ad company more money for creatives.

Also: fdroid exists. It’s like a playstore just for open source stuff. You just download it from their website and install the .apk like you would use an .exe in windows.

I think it will definitely ve backwards compatible(the wii could play gamecube games, the wiiu could play wii games, the 3ds could play ds games etc.) Nintendo has always supported at least one system jump except for wiiu to switch (for formfactor reasons) but switchgames are so small i dont think fitting them into their next console would be as challenging/impossible as shoving a disc drive into the switch.