Why would YC tell TB to stop increasing growth and revenue? They're a VC, that's what they want, of course they'd be endorsing it. It doesn't hurt their brand, again because they are interested only in making money, and founders are similarly interested in a VC that pushes their company to make more money. That you as a bystander (not even a customer) don't like it is inconsequential to both YC and their portfolio companies. See my response to another comment in the thread for more context.

Acting rationally does not preclude one from being a shitty company/person/whatever. They’re doing something sketchy, and we’re allowed to be mad at them for it. The fact that it’s better for their bottom line is not exculpatory.

Sure, I never said they weren't shitty, but it's not useful to be mad at them.

“Making money” as a VC has dependencies on a lot of things, including reputation and deal flow.

Depends, YC is doing pretty well protecting their investments