Using Firebase or similar is akin to opening a restaurant that serves take-away pizzas from a nearby Pizza Hut, after nicely putting them in a porcelain plate.

Using Firebase or similar is akin to opening a restaurant that serves take-away pizzas from a nearby Pizza Hut, after nicely putting them in a porcelain plate. If Pizza Hut changes the pricing, you either close shop or adapt. Who would open such a restaurant?