I recently made the toss up between Auth0 and my own system. Ultimately I couldn't bring myself to use Auth0, it wasn't the price but the lockin that got me. Be

I recently made the toss up between Auth0 and my own system. Ultimately I couldn't bring myself to use Auth0, it wasn't the price but the lockin that got me. Being able to log into a product is a key gate and I don't want to lose control over that even if it is slightly more work in the early days. What's more, it becomes extremely hard to migrate away from. As someone else suggested in here, I'd be happy to do a one off payment for a system under my control. However, a handing over the literal keys to my product is not something that I'm comfortable doing, especially without reassurances that I can easily migrate away from it. The fact that there are so many good libraries that deal with the most painful parts of this just make the sale harder for me.