I’m supposing that they’ve shadowbanned me because I’m using a VPN
Almost for sure.
It used to be possible to sign up like that. Now, you can sign up, but if you try to post, boom, shadowban.
I once had an account I used to answer some help request posts like computer stuff, how do I do this or that. I eventually noticed nobody ever replied to my posts. No upvotes. No downvotes. Nothing! So I looked without being signed in. Sure enuf, nobody but me could see anything I posted. I didn't know that was a thing reddit did. I was genuinely trying to help ppl. I got shit on for it. Felt bad, man.