In addition to paid SaaS(S), to which your comment applies, there are also 'free' SaaS(S), where you're not taking the role of customer at all. Instead, you're taking the role of product, or your data is. You are the product to be sold to the platform's actual customers or used to benefit the larger company in some other way (e.g. Google Photos). I don't think it's an existential problem by any means, but one has to be cognizant of this fact.