This is true. My last company used fastmail, but one guy insisted on using Gmail. Sometimes fastmail didn’t arrive at Gmail. We (tech team) said, this is a problem with gmail. C-suite said this is a problem with fastmail.
And so the word comes down, we have to move to Gmail. It’s believable decision making, but that’s how it works.
Though that's basically Google (and other large hosts) breaking the decentralized nature of email in their "effort" to combat spam.
Google isn’t as bad as Microsoft or AT&T in my experience. My personal server now is working fine with those now too.
Yeah, that's my experience too. Google doesn't like new domains, but at least accepts mail and delivers to spam (or to the inbox once the domain is old enough). Microsoft just refuses all mail if you host on a VPS whenever someone else on the block (NOT the same IP) misbehaves (or is accused of misbehaving, not sure).
Yet my bank(s), linkedin, netflix, microsoft and a bunch of mailers all had message arrive in my inbox this morning.