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Sqlite is absolutely installed on the most devices, but there is a big grey area depending on how you count "used"
I have 30 apps on my phone, am I a single sqlite user? or 30 of them?
Facebook/Netflix/etc. uses postgres/mysql, does that count as 1 user or a billion?
I'd go by queries executed per day globally. But I wouldn't be able to tell you which system wins that. If I had to guess I'd say sqlite just because of the insane amount of mobile devices that exist. But maybe that's wrong.