https://www.blowoutforums.com/showthread.php?t=1406099
Some are being done for retaliation (like Blowout's home location), but the majority seem to be to remove scammers who use car wax to remove scratches on modern cards. So if you're normally running a bulk submission, you might hold off until you find out if your account is being suspended or not.
If it was just card alterers, I'd be all for this purge. But they're also punishing those who speak out against them, or allow it to happen on their website. FWIW.