[greenish_shores]

Run 1/10,000 - 1/100,000 of computations locally, and also send them as tasks to be send remotely. If compare yields difference, repeat both. After, say, 10 tries, blacklist the provider. Of course it will take a lot more nuances to implement that, but that's the general idea. It's a no-brainer.

[remram]

Sounds like a lot of work that I would expect the paid service to help with.

[greenish_shores]

Yeah, it's "they" who should do that, of course.