My bad - I thought Tiktok (and other Bytedance apps) were banned in the US but apparently not since President Trump reversed the US Supreme Court decision. Huh, so it is mainly the European powers who are the culprits. Changed my claim.
All good, it can be a ...chore to keep track of what decisions and reversals the current administration is making.
To support your original claim - when I was in the military, we were explicitly forbidden to look at anything Snowden leaked as it was still classified and would be a violation of our clearances as we did not have either the appropriate level (e.g., TS-SCI) or need to know. Kind of understandable, but still.
I was working at a place in the UK where I only had BPSS but everybody else in the office had top clearance as they worked on military stuff, this was when The Guardian were doing the Snowden stuff.
It was easily the best way of clearing the office for some peace - mention the front page of the newspaper and everybody would lock their laptops, pick up their papers and walk.
From what I can gather the fact you know something you shouldn't, even though it's in the national news, it causes problems when renewing your clearances, so...
Congress passed a law that banned TikTok in its current form. SCOTUS upheld the ban. Trump has used temporary extensions afforded to him in the law, he cannot reverse the court decision.