GreatBlue

Or look into FreeTube, it works really well on desktop

You can 'future proof' your mail by using your own domain and use it with your proton account.
So if you want or need to change your mail provider or self host in the future, you just need to redirect your domain to your new provider.

It's a good bot ;-)

Nothing says "keeping all the malware out" more, than constantly having to remove malware ;-)
https://www.scmagazine.com/analysis/meta-uncovers-400-malicious-apps-on-android-and-ios-apps
https://cointelegraph.com/news/fake-trezor-crypto-app-removed
https://threatpost.com/click-fraud-malware-apple-app-store/149496/

Fennec (Firefox for Android) with uBlock and NoScript

You could also look into OpenWrt and maybe get your device an open firmware. For a more advanced setup you can look into OPNsense, but you will probably need additional devices for WLAN, DECT, etc.

It should be the same. But depending on the organization behind the platform, they might play dumb if you only request the deletion through the profile tools.

And despite that most customers will stay and Microsoft will learn they don't need to put more effort into security. They maybe even can get away with reducing security...

And there are Android derivatives which are Google / PlayStore or Play Services free. Like Lineage OS, GrapheneOS, CalyxOS or /e/OS

For Android have a look at NewPipe. You can add PeerTube instances and watch there. But AFAIK it was removed from the Play Store because it lets you watch YouTube Videos without Ads.

Depending on where you live, you should be aware of the fox tapeworm. It's really, really nasty for humans and can be fatal.