Yes, that's true, but at any time Google and other cloud storage companies could change their mind and offer less GB space, but I think that's unlikely at least for now., I've used the drive a lot as a backup for encrypted data.
I also use Google Cloud Services to store some important files and encrypted data, with a 15GB limit on a normal or free account that is not enough for me, because there are other files stored. Every month I always subscribe to get a larger capacity.
Now if the OP's question is to run full nodes on pen drives, although it has 2tb pen drives, it'd be more worthwhile to use an SSD, they are not as durable as an HDD, but they are more resistant than them as they do not have mechanical parts.
Using an M2 NVMe SSD may be the best solution, because it is faster and smaller physically. But the price is indeed more expensive than ordinary SSDs.
This is my imagination, there is some kind of Flash drive that is powerful and resistant enough to record Bitcoin Core Node processing.
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