Comment by lolinder

You're presuming that these are communication platforms. I argue that they aren't—to the extent that they are useful for communication it's a pure coincidence, not a design choice.

Each of these platforms is fundamentally a propaganda platform—they're explicitly designed to manipulate people into buying stuff, and that capability is frequently turned to voter manipulation. The US government has decided that while US-based billionaires having access to such influence is fine and dandy, the CCP should not. So tiktok must be sold to a US owner.