I believe so. See https://sqlite.org/consortium.html for how they're funded. Plus of course you can pay for SQLite itself with various levels of support, etc. See: https://sqlite.org/prosupport.html

My company pays the sqlite team a significant amount annually for a support contract. (Without going into too much detail, the primary database for our application is an approximately 2TB sqlite database - no, that's not a typo).