@LostXOR @yogthos @NoIWontPickAName @technology There's a few other steps they could potentially take.
The first would be to block any financial institution in the US, or that deals with the US, from sending any payments to or from ByteDance's accounts.
They could also freeze any assets currently held by US financial institutions.
Second, if they can get Apple, Microsoft, and Google on board to help do their bidding, they could pull the ByteDance app from the Apple and Google Play app stores.
That includes removing it from any apps where it's already installed. Globally.
They could also request that TikTok is removed from Google and Bing search results.
On top of this, they could do what you suggested, and ask ISPs and mobile carriers to block domains and IP addresses used by ByteDance.
And the US could apply diplomatic pressure on other countries to implement similar financial and ISP-level blocks and bans.
So, potentially, it's also blocked in the UK, Canada, Australia, New Zealand, Japan, and elsewhere.