We have a family of beavers on some property in the US. It is fascinating to watch their effect on the landscape over time. Ours cycle between an upstream and downstream habitat every few years. They allow one to regrow while they harvest the other. The area they manage is a favorite spot for many other animals including deer, various birds, coyotes, foxes, etc.
Because we are (used to be?) a country that believes in democracy and the will of our citizens. If people want to download a Chinese app and watch straight up Chinese news and propaganda (not even close to what TikTok actually is), they should be allowed to do so. That's the entire idea of the First Amendment...
Does that put us at a disadvantage to countries who don't have the same rules? Maybe. But that ideal and that principle is valuable and means something and IS the entire bedrock of American influence over the greater world.
Also motivation and incentives. The reason we haven't seen many drone attacks on civilians is that it is far more lucrative to get civilians to buy your product than to kill them, and the companies that actually have the resources to mount a credible drone attack are making a lot more money doing the former.
Terrorism in general has always been far more overhyped than actually a problem - the median number of terrorist deaths per year in the U.S. from 1970-2020 is 4, making your odds of being killed in a terrorist attack significantly lower than being struck by lightning. And the reason is simply that it's deeply irrational. What do you have to gain from killing a random stranger?