They probably have engineers working on this, but it's also growing like crazy. Since they've basically tripled in the past year in every metric, I bet the majo

They probably have engineers working on this, but it's also growing like crazy. Since they've basically tripled in the past year in every metric, I bet the majority of engineers there have been there for less than a year. Also making anything has a time cost that you cannot shorten too quickly without consequences. Systems also start breaking down as you start getting larger, and you have to start inventing your own crap. There is a reason why everything is custom at Google/Facebook scale. It's the same reason why Apple says 'we dont have the engineering resources to do that right now'. It's not money, but time, skilled people, scale, and engineers familiar with your codebase and system. The bigger you get, the more work it is to integrate into a system, and the amount of work required multiplies continuously.