I think Azure has three versions. They have Block Blob Storage, then they also have the Gen1 and the Gen2 versions. Gen2 was kind of under review until just recently in 2020, but I think they have officially launched Gen2 now. Block Storage is an Azure product, but I am not sure if it has a version. I just know it as Azure Block Blob Storage.
Our use case for Block Storage came about when we were building a database for one of our customers on public storage. The customer kept their data on-premises and on their own servers. We would get that data from them and put it into the Block Storage. So Block was being used as a file depository.