Earlier quoted context omitted.
Here's the actual e-mail the fund sent: Hey ******, I hope you're doing well. I apologise for the long delay on this disbursal from our end, and for not reaching out to you sooner. I am writing to you with an update on GitHub Sponsors, your preferred mode of payment. Unfortunately, we're currently unable to process payments through GitHub Sponsors, Liberapay, OpenCollective, or similar platforms due to regulatory con…
Looking at the required paperwork, I agree with Pocketbase to refuse funding.
It looks like the author here is from Bulgaria, so who knows what other hassles they would have on their side.