I very much doubt it was “thousands”. Its annoyance was overblown imo. It really wasn’t that big a deal compared to the other examples I mentioned. You can’t put it on the same level as the train toy as that is far louder and more obnoxious due to the way it works by triggering everyone’s /train emote. Out of all the group annoyances I could think of, the sunflower emote is right down the bottom of the list in terms of actual impact.
The cat mount spam is that cat mount from the shop. You can drag its butt along the ground by spamming its jump and mount special and as a result, spam infinite cat meows that are annoying AF to everyone around.
The unicorn pets are from SL and this expac. They spam a demonic shrill squeak emote like every 3 seconds on an infinite loop.