I wonder if a startup opportunity exists to be a B2B only provider that has all the infrastructure trappings of an AWS or Google Cloud, but never selling direct

I wonder if a startup opportunity exists to be a B2B only provider that has all the infrastructure trappings of an AWS or Google Cloud, but never selling directly your services on the open market, but instead selling your services contractually to other businesses (in a sense, not sure if my terms are lining up here). If this is a million dollar idea, I'm just going to give it away I guess, so here goes nothing in explaining it! Imagine an AWS/Google Cloud like company that only sells B2B, so Cockroach for instance, could pay this company to host their own cloud offerings, plus sell through other cloud offerings of the said B2B service but under their marketing umbrella. The B2B service gets a nice chunk for administration et. el plus some fixed percentage of gross (maybe? i dunno what it'd look like). I think if you contractually obligate yourself as a business to never sell cloud services directly (only via partners like, in this instance of theory, cockroachDB, but it could redis, mongo, whatever), it'd be a fairly stable and comfortable arrangement. Could also be a way for other SAAS companies to buy into infrastructure without indirectly funding a potential competitor too. Maybe its too complicated to achieve, though.