If you are in one cloud you aren't truly HA. You also lose all bargaining leverage. If a vendor doesn't have to compete for your business, they won't and your hosting costs will reflect that. Spotify is a big name and is in the unique position to bargain because of the name and PR. But the average enterprise should really consider the tradeoffs. I get that its hard to have hybrid cloud model but there are agnostic tooling that makes this easier to to do then ever before. Its worth considering.