I didn't notice that you were posting from Mastodon as I'm on Lemmy and your posts appear here just like any other Lemmy user - but the @fuser at the start of your messages is probably the tell, I think Mastodon defaults the username you're replying to, whereas Lemmy doesn't. It's great that we can use different applications without some corporate gatekeeper capturing everybody's personal info at the integration point to hawk to an advertising company.