Just read this https://kevquirk.com/threads-and-the-fediverse from @kev. For me the big danger of #Threads is not adverts, or culture etc, it's the long-term dangers of allowing the biggest gateway to the fediverse to be corporate.
There's lessons from email we should learn to avoid being all surprised pikachu a couple of years down the line
@pluralistic has a good take here: https://webcache.googleusercontent.com/search?q=cache:https://doctorow.medium.com/dead-letters-73924aa19f9d
But you can easily find me sysadmins who gave up self-hosting email for the same reasons.