Firewire was an originally open standard, but there came Apple and demanded to exact a symbolic 1$ per device payment.
Despite FireWire being an indisputably better standard from technical standpoint, that 1$ completely ruined the mood with OEMs, and they lost the market.
USB on the other hand, was not really open, but Intel's central leadership in it guaranteed that there were no disarray with association peers throwing random capricious demands.
Most USB implementers were random Taiwanese OEMs who never formally joined the USB-IF, but nevertheless Intel was smart enough to close eyes on that.