I wouldn’t count on google drive doing anything in particular after expiration, unless that is expressly part of the product description. Just because you can observe it happening now doesn’t mean you can expect it to keep happening. For that matter, Google cancels products all the time. So I wouldn’t even rely on the paid plan not being withdrawn at some inconvenient moment. If you really want to use it, then best strategy is probably use it as long as it lasts, but have some plan B in mind if it goes away.
Oneprovider.com shows lots of offers in Istanbul, though servers are expensive there compared to a place like Hetzner: