My company actively does projects using Bubble for business clients. It is awesome to develop with and allows for integration to handle esoteric scenarios.

Speed is the main critique of Bubble (but, there are server packs that could be purchased to increase horsepower. I have never tried those though. Most of my current clients have business users and prioritise functionality and flexibility over breakneck speed. They are happen on the entry paid plans)

For an MVP, I would highly recommend Bubble.

Mobile Apps are not native or anything close with Bubble, but if responsive apps work, it is a great choice.

I'd be happy to chat and provide my experience.. Feel free to email me at santosh AT n0c0de.com