Pretty unusual, especially state-owned. There was a similar program on EU level that was just cancelled, apart from that I don’t know any other countries investing in open source.

Honestly, this sounds great!

Funding.json is a good idea for a standard proposal and seems to solve most problems I‘d personally recognize with FOSS funding :)

Billy should really not support them, Ad Block Plus let’s advertisers pay for having their ads checked as “acceptable advertisements”, i.e. is selling out the core functionality of their product. Billy should use uBlock origin, which afaik does not accept donations, he could however support something like PiHole .