This is damn true! I run several email servers, self hosted, with all dmarc, dkim, spf etc specifications OK and google still reject my emails because my IP is in a range from the ISP that is doing spams. So if I have for example 193.45.50.1 and another IP from the same ISP`have 193.45.50.2, the entire block is put into spam list. ISPs doesn't give a shit, even if you put an incident, google doesn't give a shit. As you said is a tacit conspiracy between ISP and google to push email servbers to be hosted on their servers/IPs so they can control you more. fucking nightmare
This is why these things need to be ensured / fixed on the protocol level.
Consolidation is inevitable because humans are lazy and prefer to just pay someone else to handle it.
But I suppose one way to try to ensure decentralization is to make self-hosting as easy as possible and as early as possible, before consolidation can happen.
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