Theee is little incentive to control an identity since there is NIP5 as soon as an account is compromised they can notify followers and make the NIP5 invalid on the old account. Followers will know almost immediately the user isn't authentic if it were a big name account where there was an incentive...

Nsec is always hot just like Satoshi's and every early adopter's Bitcoin wallet. Further, nsec isn't nearly as valuable as your monies.