I got scammed on Swappa about six months ago. I was buying a used Google Pixel tablet in "mint" condition. It was really used and terribly scratched up.
Swappa staff were unhelpful and only after I opened a dispute with Paypal did I get my money back.
I don't blame Swappa for a random dodgy seller, but this was an "Enterprise" seller, whom is still selling on Swappa today!
See this reddit review, which isn't mine, but is almost exactly what I dealt with.
Reading OP's post, I can't help but wonder if they bought a Verizon Pixel. This is a very very well-known gotcha. Verizon locks their bootloaders and you can't bootloader-unlock Verizon Pixels, even after they are carrier-unlocked.
You're joking, but still: that's one very possible outcome of both requiring centrally issued certificates for security reasons and browsers refusing to display websites without.
Effectively certificates are now a license to publish.
It's regrettable that you would spread misinformation, and easily explained/debunked information at that. This is a reasonably well-known issue and even with the extremely bad and limited information you provided (no model numbers or other info), I already know exactly what your problem is.
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