There most certainly should. But Americans live in a corporatocracy.

I've run a mail server since the late 90s. I gave up running my own outbound years ago. Whether it gets received is too inconsistent. Primarily, make sure the IP you use isn't on any spam lists. If it is, get a new IP or try to submit appeals. Make sure you have the standard anti spam/authenticity measures implemented (they're listed in the OP).

These are the minimum. Years ago it was enough to have reasonable delivery. Unfortunately these aren't that helpful anymore because spammers also set them up (often with seemingly randomly generated domain names). I assume because not having them was a fairly strong signal for being a spammer, so now they also set them up, which also means there's not really any configuration / setup you can do to seem legitimate (aside from mail volume and the content itself which will be analyzed).

Anyway running your own SMTP itself is easy. The problem is getting your mail to the inbox or at least spam/junk folder (your mail may get blackholed and not even show up in spam). At least when you get a rejection, you know something is wrong, but many times the receiving server will indicate a success code and simply not deliver it to the user (not even to their spam).

Yeah, I figure I did enough of a step by moving to Tutanota. Selfhosting email seems like overkill unless you're running some large organization or doing self-hosting as a hobby.

Maybe the way to fight GMail’s outsized power is to stop using GMail.

Stopping your own gmail use is trivially easy. It just scratches the surface. In order to not lick Google’s boots, you also need to stop sending email to gmail users. That means doing an MX lookup before emailing to see if their vanity email address is on a Gmail host. And of course this also means not sharing an email address with gmail users.

I do that, in fact. I also boycott Microsoft. In the end, this means I am not using email much at all.

Yeah everything is disabled its Firefox focus, everything always worked fine then like this past week all sorts of sites started showing that