I have a feeling Meta's #Threads "Sponsored" #ads will be client side on Threads. They might be reblogged by some.
The "ads" that will litter the floor will be the posts from company accounts that make it through to our timeline via comments and boosts because we live in an era where people can't see the ad behind the content. 😉 Like the McDonald's commercial in this official Roku screensaver, scrolling in like a flea on a dog's tail.