Well, no. Unless you take serious precautions (like using vpn and a different browser) for multiple accounts, reddit can easily track and ban ALL your accounts, effectivly locking you out of reddit completly.
This is not possbile on lemmy where you can simply make an account on another instance.
Yes. I was recently banned off lemmy.ml... and it took me asking dumb technical questions all over Lemmy to discover that no, it wasn't just a login problem and that you don't actually get notified of any bans - you have to go look it up in the modlog.