Durov is a billionaire, he has stuff worth stealing. Kim DotCom at least was once, and is sharp enough to have some stashed he could be separated from with the correct wrench.
State gets $$$ for vanity projects, and sadists get a feeling of triumph over an accomplished social superior brought down to their level.
Rounding up thirty broke-ass Nostr devs in seventeen jurisdictions? They'd need to be really, really bored.
And even then I've git clone-d the good stuff.
Nostr not going anywhere!