That wouldn't be cross-platform. Browsers couldn't even ship SQL because it would inevitably tie them to sqlite, specifically, forever. They definitely can't ship something that requires a whole Linux kernel.
Nonsense.
Chrome store their sqlite db in C:\Users\%USERNAME%\AppData\Local\Google\Chrome\User Data\Default\databases
And Firefox:
> Why Firefox Uses SQLite
> Cross-Platform Compatibility: Works seamlessly across all platforms Firefox supports.
https://www.w3resource.com/sqlite/snippets/firefox-sqlite-gu...
I disproved that.
Dont change the goalpost.