It forces the other party to change their behavior or at least gives you leverage to make a deal where both parties would agree on some equal set of rules. Here, the freedom to use US social media apps in China and vice versa.
It's an interesting turn of events, and I'm at least curious to see how this turns out. This is definitely not the start of WW3, as some have proclaimed, just US doing the same trick as China has been doing. Tensions were a lot higher during the Cold War.
Technically this is the beginning of the next WW3, we're in the negotiation and economic pressure strategy stage - like starting to take away toys and access from a child who is behaving badly or unacceptably; easiest to reference the concentration camps the CCP is operating for million+ Uighurs, where the United Nations has accused CCP of genocide.
India has clamped down banning, and other nations and politicians - perhaps under pressure of their citizens, are waking up, becoming aware - or at least enough that politicians can then more safely take action without succumbing to propaganda coming from CCP and other bad actors who are consistently trying to undermine democracies.
It's an interesting turn of events, and I'm at least curious to see how this turns out. This is definitely not the start of WW3, as some have proclaimed, just US doing the same trick as China has been doing. Tensions were a lot higher during the Cold War.