That's great! While many people don't have multiple GD accounts I have plenty here. When I was able to create them without SMS validation (which is limited to 3, 4 times for the same phone number - after that you'll need a new number) I took advantage of that. Until now I haven't figured out how to bypass this requirement, so I would say it's very random - you may or may not be asked (and if not asked then you can create directly).The upcoming 5.9 update will include an all-new Google Drive integration with support for shared folders and Team Drives.
More info on what else is coming in 5.9 can be found here.
https://firecore.com/forum/topic/13575
Since I created dozens of Google accounts (each one with 15 GB for Google Drive) unfortunately I can't inform the login/password for all of them in an app - that would take a lot of time.
Even if I did I would have to visit each one to access the desired content. That made me define one (main) account as the target for certain kinds of contents, such as: account1@gmail.com for movies, account2@gmail.com for ebooks, and so on.
Since I haven't had any issue with my contents and they stay there forever (provided I don't share them with anyone/in public) I prefer using this service over others (like Dropbox), since we can stream from these Google Drive accounts. This would be very useful for those with a serious lack of storage space in their Apple devices.