Quantity is a type of quality. Lots of people mainly use cloud storage as a cold storage locker for backing up photos and documents. I'm sure there's ways to innovate in the space that would make certain clouds more appealing, but most solutions are already effective as simple storage lockers. Doing it better instead of cheaper at this point is more likely to be either a megacorp affiliation perk, like a discount on a YouTube Music subscription, or phone company style family plan discounts "Get discounted storage for the whole family if you pay slightly less than the price of four memberships!"

... better than AWS with its SLAs, that every major company relies on to some extent?

Yes. There's a reason companies like Digital Ocean, Heroku, OVH, ZEIT, Joyent, Rackspace, Linode, Cloudflare and many more have been able to survive and grow rapidly in an AWS-dominated space. None of them are competing by undercutting Amazon in price.

OVH is certainly undercutting Amazon in price. The free bandwidth included in each instance is already a dealbreaker if you actually use the instance for anything other than very heavy cpu-bound loads with small output to send back.

Ahh yes, the mythical four nines.

https://medium.com/@guisebule/the-sla-is-a-lie-babd16d629d2

"Better" in a niche-filling way, not a "this is very well engineered, but for my use case it's very overengineered" way.