Isn't it all rather self-defeating, then?

ByteDance will keep no data in Canada, will not employ any Canadians, will not report any information to Canadian authorities, and will have no reason to comply with Canadian warrants or court orders. (Or even judgments.) At the same time, all Canadians can continue to use the app.

On balance, this seems bad for Canada and great for ByteDance.

Can .ca App Store still offer the app legally if no biz entity operating in Canada? If no, then it's the same as ban the app

But what's the point? It's more common for a government to force companies to have an office in the country to exercise political or legal control (see for example recent news about Twitter's Brazil office). Why banning them from having one?

What is the strategy here? Why does banning ByteDance from having offices in Canada do anything?