Some might say that if all it takes is cash to catch up your moat then you don't have a moat.
Sadly most businesses who claim to have a moat are infact just doing the same thing a tiny bit differently and just dressing it up in marketing bullshit to make it sound like they have some amazing secret sauce. The old rolling a turd in glitter routine.
A real moat is something like ASML. Throw as much cash as you want at it but its going to take you decades to catch up, if you ever do.
Less extreme examples than ASML exist, of course. But you get my point.