Developer attitude towards spending money on software... "Invented Here Syndrome" when it comes to the choice between writing 50 lines of code vs. pulling in 4

Developer attitude towards spending money on software... "Invented Here Syndrome" when it comes to the choice between writing 50 lines of code vs. pulling in 4mb of client side dependencies to use a giant 3rd party (yet Open Source and therefore Free!) library that incidentally offers a solution to the same problem, after about 50 lines of configuration. vs. "Not Invented Here Syndrome" for anything that involves paying money for anything. Such as that API that solves the exact problem that's blocking us from moving forward, offered by a company that does nothing but solve that problem for a living, because we might outgrow their Free Tier and therefore face potentially thousands of dollars of charges. Argued among half a dozen market-rate developers of a venture funded startup that could really do with having launched yesterday. Rather, let's pause to build our own version of that service first. Then build our product. I tend to notice these things while working as a consultant, and thus something of a bystander in terms of being able to do anything about it.