system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What happened to FireWire? It was taking over, seemingly faster than usb, yet I don't see it anymore...
gpt
Firewire was more expensive (both patent licensing and hardware cost) and USB was good enough.  The difference isn't huge, but when there are two similar competitors in an area where compatibility is important, a slight market advantage tends to snowball, since the slightly more common one is inherently slightly more useful.  (See VHS vs Betamax, BluRay vs HDDVD etc)