Hmm, only Gmail addresses appear trustworthy then? What else is so prevalent... Outlook?
I already have my domain firstlastname.com with Google domains. I can setup email forwarding for free. All goes to my gmail address.
As far as normal people their reaction was "That's cool you have your own email like that"
So I have a .family address for my “primary” account and a gmail account for fallback purposes.
I also sometimes use first@firstlast.com because some services don't allow emails starting with keywords, Facebook for example doesn't, or didn't at the time I tried, allow mail / info / admin etc.