How do you know that Threads won’t inject ads as posts?
Ads in Instagram are posts from accounts you don’t follow. Threads can’t make you follow promotion accounts you don’t want to follow.
Depending on where they want to sit in the scumbag chart, there’s no technical barrier stopping them from selecting threads-hosted accounts with high metrics and injecting advertisement posts under their handles.
That would be A) identity fraud because it would be my favorite fair trade drink endorsing Coca-Cola without the ads being clearly separated as required by many jurisdictions and B) not targeted advertising in any way.
Even if Threads posts illegally embedded extra ads: Users could just opt not to follow Threads accounts. Threads cannot just magically place ads in the feed. That’s impossible.
Remember, the rule is “Embrace, Extend, Extinguish”.
Threads is doing this. Kicking them to the curb regardless of the cost is the only solution.