It does, yes. I use the tasks.org app to manage.

I just checked and yes. When you use the link, it puts you in like a guest account to view the calendar.

Mailbox.org. You can connect via CalDav to your calendar there.

The Play Protect warning typically has an option to install anyway. Take another look.

Yes. I always disable it because I don't drive (typically).

LibreTube here too. I have multiple devices so the subscription sync with a Piped account is nice (so nice that it is the reason I use it over Newpipe).