All I know is that I was quoted $50K from a Ukraine team to build an MVP, as long as I could provide detailed specs down to every function. I hired an intern who used bubble/airtable to build our product in two months and had ten paying customers in 6 months. After almost two years have yet to find a reason to move to a traditional stack. We have had 6 hours of down time in those two years thanks to bubble issues. I can live with that.