I've heard that too. Your posting inspired me to check. I see daily accesses from claudebot and gtpbot to /robots.txt on two sites. Also from something called amazonbot, which may be another AI bot?
I'm curious — if that's your attitude, why not all bots? You can say "User-Agent: foo\nDisallow:\n\nUser-Agent: *\nDisallow: /" to allow only named bots and reject them by default.