The question is, is this your core business? If you want to roll your own ML / CV API and your investors / customers will value you based on it, great. If it's not your core business, then SaaS / API interfaces save you time / money / ability to get into the market. Composability is what we do nowadays and you're always going to be exposed to risk. Recognize that risk and move on or go out of business trying to do it all yourself.