I feel like that has happened to me 2 or 3 times. It's important when talking to VCs to know where they are with their own fund. Did they just raise a fund and they are allocating it? Or did they raise it 5 years ago, they are missing their numbers, the LPs are on their case and they have a portfolio company or two about to die that needs to raise a round? They'll copy your deck wholesale without any shame. They are the ones in a pinch and the dollar amounts are too high to care about shame, they are in full hustle mode.