You can, but you may have to bounce around servers a bit to find one that works. I’ve had good luck with servers in Norway (not 100%, but better than other countries).

You can. I did it. I even used temporary emails since I fucking hate Reddit. I deleted all my reddit accounts. Going forward I am thinking of using my 'real' email only in very few select applications and pretty much throwaway emails on everything else.

I recently signed up for an account on a VPN with a throwaway address, as usual—I torch my account every few months and start a new one—and was almost instantly shadowbanned. This may have been due to other factors, though...like the fact I posted a question in the mason bees sub? :D

Get a VPN using cash/XMR (Mullvad/IVPN), and then either use them directly or over TOR to create the account.