Comment by Dalewyn

Not only is it potentially cheaper, it can be better than rolling your own stuff in-house.

Kadokawa can tell you all about how their in-house shit (literally, Japanese suck at computers) got pwned while the stuff they had in the cloud (I hate the term, but it is what it is) were unscathed.

Keeping in-house has its benefits, but the costs are also steep.