It's a very very cool idea, but I'm still not clear on the main benefits.
Bottomless storage: yes, but couldn't you theoretically achieve this with plenty of cloud DB services? Amazon Aurora goes up to 128 TB, and once your DB gets to that size, it's likely that you can hire some dedicated engineers to handle more complicated setups.
High durability: yes, but couldn't this be achieves with a "normal" DB that has a read replica using object storage, rather than the entire DB using object storage?
Easy replication: arguably not easier than normal replication, depending on which cloud DB you're considering as an alternative.
Bottomless storage: yes, but couldn't you theoretically achieve this with plenty of cloud DB services? Amazon Aurora goes up to 128 TB, and once your DB gets to that size, it's likely that you can hire some dedicated engineers to handle more complicated setups.
High durability: yes, but couldn't this be achieves with a "normal" DB that has a read replica using object storage, rather than the entire DB using object storage?
Easy replication: arguably not easier than normal replication, depending on which cloud DB you're considering as an alternative.