I mean, we’ve also seen a lot of cases of the exact opposite.
Where? Where was there a recent independence movement that succeeded and was punished by the original country?
Of course you don’t let them starve, but you also don’t let ships into your territorial waters near areas with violent insurgents, and you warn your neighbors that trade will suffer if they’re found to be supplying said insurgents.
Wouldn't blocking supplies starve them?
Again, this is silly debate as Texas will not secede but if they do it's crazy to think that US government would just abandon millions of democratic voters living there. There are pretty much two options: either US government would use force to regain the rule there or would pretend that everything is OK and keep cooperating (like Spain and Catalonia, give them more and more independence without formally recognizing it). They definitely would not impose blockade and risk creating North Korea style regime right at their border.
And what did I say? "Just get extra phone and use some fake google account for android auto and you should be fine". Kind of like I'm saying that while total privacy is not possible you can find a good compromise, wouldn't you say?