But Facebook isn't backed by the US government given that we keep pulling them in front of congress and now the executive is making an attack on Section 230. That's not to say that FB isn't globally dominant - just that it isn't propped up by any country, and it'd certainly be fair to punish them for breaking or flouting rules.
Boeing as a company producing a massive amount of planes for the EU is absolutely aligned with European interests. Their current scandal is also a scandal in the US and they've also been (and continue to be) punished and investigated for it.
You can't just say "but Facebook!" in response to TikTok, a company siphoning data into a blackhole in China at the behest of the CCP and engaging in censoring as befits the CCP. The current status quo hurts everyone whether in the US or the EU.