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It wasn't really. Otto was touted as a long-term successor to Vagrant, it never gained much traction and ended up being decommissioned a year later: https://www.hashicorp.com/blog/decommissioning-otto/

Vagrant OTOH, is still being maintained.

Otto was about providing high levels of abstraction but it couldn't deliver, just as much as Terraform.

Terraform also started as a happy path abstraction, then the nitty gritty reality kicked in and suddenly you are no longer abstracted from the platform but forced to code on another platform for another platform. I'm even surprised it took off this much.

Otto was decommissioned.

https://www.hashicorp.com/blog/decommissioning-otto/

I think Otto is dead