Most of the SQLite test suite, TH3, is not open source or available to the public. You need to pay an undisclosed amount of money to access it, which would seem to defeat the already dubious proposition of vibe-coding a SQLite clone.
For an individual, but for OpenAI this would be a trivial marketing expense. The purpose is not actually to replace SQLite but to be able to claim your software is capable of it, to perpetuate the ongoing mania.