Dating apps and websites depend on proprietary technology, network effects, economies of scale, and branding in order to lead. As such, they are very prone to becoming monopolies, and a market leader wouldn't be likely to use someone else's SaaS app. I'm just not sure there is the demand for 1000 semi-large dating apps unless tech isolationism somehow becomes the norm, and it that happens then it would include SaaS isolationism.