Yep, and the while thing is moot anyway because use of the systems does not require ownership, so while the owners can exert more pressure on the algorithm and change what shows up other actors can do the same a little less easily on each platform. Propaganda is alive and well, so maybe try to limit yourself somewhat to a smaller group of people you actually know in person and be critical of information coming in.
Yeah, the whole “China is doing propaganda using TikTok” line is kind of like saying Russia is using bots on YouTube. Like, yeah, maybe, sure, but focussing all your efforts on one single platform and ignoring the rest is silly. As the red team you would use as many different platforms as possible, make sure your disinformation output was broad and came from multiple, even opposing, ideological positions, and absolutely swamp the information space with junk. If nothing is reliable people don’t approach things carefully, they just check out. Once people check out it is a win.