There is a lot of SaaS that is essentially "for the buyer to the buyer", what I mean is that the software doesn't provide content to somebody else, or there is

There is a lot of SaaS that is essentially "for the buyer to the buyer", what I mean is that the software doesn't provide content to somebody else, or there is no incentive to serve malicious content (e. g. B2B). Why would tampering be relevant in those cases? There are situations where it's relevant, but I don't think it's as many as you say