I don’t recall the exact quote. We do have a ton of traffic (more so back then as it was a freemium product then). Not sure if it included their warehouse as well.
Our dev team at the time said rewriting it internally was impossible, so we actually paid it for 6 months. After changing the team, this was on the top of the list. It was trivial to switch.
Now, all the services that we used were stable so the benefit of easily adding and removing services was not something we needed.
Rightscale suffered similar fate when their rates kept going up. At some point it became cheaper to rewrite it ourselves.