I think this may be generalizing a bit too much. Certainly I would use Twilio instead of building my own telephony system, or use AWS instead of setting up my o

I think this may be generalizing a bit too much. Certainly I would use Twilio instead of building my own telephony system, or use AWS instead of setting up my own servers. But in this case I think the reason many developers here (myself included) have an episode of build-it-myself syndrome is the many millions in funding and exorbitant pricing for something that seems (but may not necessarily be) trivial to implement. Obviously there is the benefit of having a team of people who are constantly making the system better and more robust. I think with ML there would be a serious value proposition here, e.g. allow a learning system to automatically roll out a new feature for you, and reverse the rollout if things appear to be going poorly. Even the worst case of built-it-myself syndrome would not engineer a custom feature flag system that far.