edit: The page also contains the stronger statement wmanley quoted, so it wasn't a misleading quote as I initially assumed. I counted a total of 5 committers in the last year, so it does indeed look like SQLite does not accept outside contributions at all, even with a public domain dedication.
That page says:
> the project does not accept patches from people who have not submitted an affidavit dedicating their contribution into the public domain
which is quite different from your shortened quote. This sounds similar to the CLA many projects require for contributions.
How many outside contributions does SQLite accept in practice?