I can't tell if this is satire or not with the first sentence and the "0 users" parts of your comment, but I know several solo devs with millions of users who self host their database and apps as well.

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da02 a day ago | parent [-]

What hosting providers do they use/recommend?

	▲	satvikpendem 12 hours ago \| parent [-]
		I believe they use Hetzner although there are some comparison sites too: https://serverlist.dev