I've only launched B2C myself, but I've worked at B2Bs.
The thing is that B2C product is generally cheaper and have higher churn, and you have to go much wider for marketing to get to user levels that can cover operating costs.
B2B on the other hand, if you can cut their costs significantly you can ramp up the price and break even maybe even with a handful of clients. Tho with forever subscription you kinda have 100% churn, so you'll depend on getting new customers in all the time.
The thing is that B2C product is generally cheaper and have higher churn, and you have to go much wider for marketing to get to user levels that can cover operating costs.
B2B on the other hand, if you can cut their costs significantly you can ramp up the price and break even maybe even with a handful of clients. Tho with forever subscription you kinda have 100% churn, so you'll depend on getting new customers in all the time.