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Modular now provides hosted Matrix, including DNS and branded Riot (the Matrix app), and a web-based management interface. Apparently many of the Matrix core developers work for them, so that seems like a good and sustainable move on their part.

In case you want to play with it, they offer a free month for testing. Their pricing is obviously targeting companies, which also seems like a good move regarding sustainability. https://www.modular.im/services/matrix-hosting#pricing