Firstly, I fully get your position on NDA’s in this context, but I think it’s been taken slightly out of proportion.
The way I read into it (based on the interview, and my own perception), was that it was simply a case of not wanting to put mock ups and ideas out there as fact.
With previous quotes from users on this forum being used in arguments against Monzo on a national scale, I understand why they might be a little nervous about revealing too much.
Back to your quote, and it’s partially true I guess.
Only because I’m now unconsciously biased from what I’ve seen, so any new “idea” I may have could potentially be based on the interview I had.
That being said, it doesn’t stop me debating the pros and cons of packing pet insurance in a bank account (a “joke” I made earlier in the thread, not a Monzo promise 
).
I would say that it’s important for everyone to have their voice heard here, because Monzo are a long way off confirming anything, and will still be swayed by people like me and you, and the rest of the forum. 