>>aendru+(OP)
I mean I think you could also do this on Mastodon but it would just show a "verified" highlight for amazon s3 in your profile, not that it would get verified as your username.
>>Pxtl+K1
No, you can’t. To own s3.amazon.com the HTML on that exact domain and not a sub path needs to have a specific link back to your profile on it.