If you use Messages in iCloud, deleting a message or conversation on your Mac deletes it from all your devices where Messages in iCloud is on.
Technically that doesn’t say that deleting them from your phone will delete it from the backup on your Mac
I agree. Given that I use Gmail, Google ought to know basically everything about me, so why do I keep getting ads for diamonds, instead of GPUs?
Why are they spying on me if they aren’t going to use that information?