[rocqua]

That would depend on whether you trust that they are zero-knowledge. It is certainly possible to build a client that works like that, but their client wasn't open source, so there is no way to confirm this.

However, if you trust them on the canary, why distrust them on the claim their service was zero-knowledge. It might make sense if they are 'amoral enough' to lie about being zero-knowledge, but 'moral enough' to admit to being served a warrant. I think space for that level of morality exists, but is small. The other issue would be if they weren't zero-knowledge through an unintended bug.

I can't really give a definitive judgement.