Regarding your second paragraph, investors looking for the the YC startup definition don't like services companies because they couldn't scale at the pace of product companies but they are specific investors oriented to these companies because they have a more secured cashflow.
BTW, some people like Michael Cusumano [1] argued about hybrid companies to better handling economic cycles.
[1] https://mitsloan.mit.edu/faculty/directory/michael-a-cusuman...