At my previous place I saw this in reverse. Over the previous years we had invested in building up our own email infrastructure. Because so much had been inves

At my previous place I saw this in reverse. Over the previous years we had invested in building up our own email infrastructure. Because so much had been invested (sunk cost fallacy), no-one could really get their heads around a shift to SES, even though it would have been a slam dunk in improved reliability and developer productivity. Whereas if we were on, say, Mailgun, and then someone wanted a shift to SES, that debate could probably have been a more rational one. I just point this out to say that investing in your own infrastructure can be a very real form of lock-in itself.