What to you (and pretty much anyone else) looks like a business that just needs adjustments to reach profitability, to the VCs it's profile maintenance work for little relative benefit in the long-term. The chances of that company turning 10-20x profits in the next few years is basically zero and they just cut their losses (in their view).
In essence, if the startup is slowing down and perhaps not going anywhere, then the standard existing deal with founders where the founders can cash out only if they enable to VCs cash out at a profit (for example, if they manage to pull out all the stops to make a failing startup look attractive to some bigger fool) is exactly what VCs want, and in such a situation the founders have no leverage to extract a compromise that's worse for VCs.