

I was also confused at first, but OP is using “plausible deniability” to mean “depending on what decryption key you attempt to use, you get different ‘decrypted’ data”, so you can have an alibi I suppose. Not “plausible deniability” in the sense of “plausibly this isn’t encrypted at all”.
I think it would be fine if it were opt-in, but then you wouldn’t get enough data to get accurate traffic estimates