His biggest mistake was printing the TON currency.

He created himself as a single point of failure.  Nostr inherits a single point of failure from the fact it started as a one person hobby project.  And while some parts are delegated, not really alot.

For example just one of the 4 nostr primitives was changed in the core protocol, against community wishes, and there's nothing we can do about it.  When this was pointed out, the assertion was that bitcoin has dozens of changes each week and is more "dangerous".  Nostr very much does have a single point of failure.  Durov's experience might be a wake up call, I hope so!