It's not necessarily about an early warning. I'm not saying it's impossible, but just showing you ways it would most likely be detected/suspected. It's price action on the market would be one.
I just think you have too much faith in people keeping secrets especially of this magnitude, either escalating the abuse (thus the obviousness) or reaching the community from users reporting it (thru the grapevine or discovering it by themselves). We already have precedent of this in Bitcoin of lone anon users warning devs of inflation bugs that no one else was aware of.
Good news is you don't have to agree with me though.
I already showed you how to sidestep all of that worry.
Use Monero like a checkings account/spending cash (strong privacy,fungible,cheap) and Bitcoin as your savings account.