>Why would any bank look at SVB and NOT think "oh, time to take more risk for more profit; the government will prop up the FDIC limit if we fail anyway".
This makes zero difference to the bank. The bank doesn't get saved by the FDIC limit, as you know. What happens after the bank fails - whether the depositors are made whole or not - is immaterial to the people who owned the bank, who now see their asset (the bank) worth $0.
If you want to make a moral hazard argument with respect to the FDIC, you'd have to make it with respect to the actions of depositors.
Also, WRT the $250k limit, that's the minimum they will guarantee. They have always tried, and in recent decades always succeeded, in making depositors whole one way or another, usually without spending much (if anything) from their insurance fund. The $250k is the worst case scenario.