I assume because realistically, LTO has already a large share of the backup market in business/enterprise, and for most people, offsite backups either through the internet, or 3-2-1 using portable hard drives are easier and cheaper.

ODA is expensive. The drives reportadly die quickly, and LTO is the animal you know. ODA only ever had one manufacturer. I believe LTO still has two or three? (IBM, HPE and maybe Quantum, but I think they are IBM).

Putting all of your eggs in one basket is never a good idea.

There were a few rumours going around that Amazon Glacier were using ODA for backups 10+ years ago, but I'm pretty sure they were just That-rumours.