It's dangerous because it limits your options. Say you take money from an angel that is strongly associated with a single VC fund. Assuming you do well, when

It's dangerous because it limits your options. Say you take money from an angel that is strongly associated with a single VC fund. Assuming you do well, when you need to raise your series A, if that VC fund declines, then it's less likely another VC will fund you. And they know this. Essentially, you have given them a lot of power over your future financing.