This is complicated and brand new to all of us but if people realize they’re a part of something bigger than them. They would want to be part of that too!
That’s not how this works. The overwhelming majority of Threads users just saw whatever thing FB put on the instagram accounts and clicked it. They have probably never heard of the fediverse and even if they like the idea they’ll just go “oh, I’m already on it, no need to bother”.
We can get exposure without letting a company specialised in manipulation and astroturfing straight through the door.