OTOH Victoria schoolchildren used to do cross border field trips. They ended the practice during the Trump Muslim ban to avoid trauma to kids.
It's that the rhetoric coming from Trump which, through significant threats to the on-going employment of anyone deemed to be not enthusiastically complying with these daily-updated mandates, increases the likelihood of un-justified "bad thing" happening upon attempting to cross the border to the US.
Basically, the current regime makes it unpredictable, which increases risk. Increased risk = decreased likelihood of related action.
I'm not sure how far off topic we've gone, but "Canadian Devs backing out of attending GDC" would also have a protest aspect to it due to DJT's belligerence towards Canada.