how they plan on collecting fines is pretty simple: the same way they have done for the past 20-ish years.

google already pays fines in the hundreds of millions annually in the EU due to compliance issues.

they can’t NOT pay, because then they would be opening themselves up to punity actions.

if they continue to pay, they continue to operate, if they stop paying, because they mistakenly believe trump can save them, they will be treated like any other criminal organization and have their operations shut down, their assets seized, and the ones responsible facing criminal charges.

the thing about the bank accounts gets…complicated, but can be boiled down to “whatever is there, will get seized by the bank”. and “withdrawing the cash” isn’t really a thing they can do just like that. monetary assets in the EU for mega-corps is mostly in the form of bank agreements (i.e. debt), which is basically just contracts. so the corpos would lose out on the banking institutions on top everything else.