A great thing about the internet is it's decentralization. If you don't have tons of capital or income, you might consider moving to somewhere with a lower​ cost of living and making your app there. You can host it nearly anywhere with an internet connection until you hit a global scale, at which point you should be able to go to a more expensive area.

I'm not sure what's meant by "hot pot." The above recipe can be done with a "crock pot," although crock pots are expensive relative to an iron pot. Can be bought used, or donated from friends/family. Bottom line, adapt to circumstances, and try not to live on ramen.

Buy an electric pressure cooker and do it all in that.

Cheaper and smaller than an oven, and no need to soak beans overnight.