I think I figured out the "CoSo randomly playing audio, even in Ostrich mode" - it's Ostrich mode. Apparently on Safari (macOS 13.3.1) with Ostrich mode *ON*, it autoplays CoSoCom, twice. And because CoSoCom isn't showing, I can't click the stop button.
With Ostrich mode *OFF*, it autoplays once, and clicking the "Stop" button stops it.
"Normally, Iβd be worried over Mr. Ritchieβs violent gun message concerning the inclusion of trans people β if he were capable of aiming correctly. Alas, he doesnβt appear to be much of a threat with firearms."
https://charlotteclymer.substack.com/p/kid-rock-doesnt-know-how-to-shoot
WTF? I'm suddenly getting a bunch of "phone call verification codes", the computer-generated voice doesn't identify who they're from, the phone number doesn't who called.me track back to anything recognizable.
The most interesting thing? It's to a virtual phone number I have that isn't registered to *ANYTHING* that should have a phone verification code.