Exactly the same as GPUs. There's two companies.

if you want top shelf routers, it will have qualcomm chips (cpu/soc/radio). If it is a budget one, it will have mediatek.

Also, we had a flood of demand and new versions coming out. which literary added nothing. Some will wrongly say "mimo", "beamforming", etc... but those were all present since "wifi5" (ac) and have just been "standardized" in wifi6 (ax), wifi6e (ax+6ghz), wifi7 (be)... the real improvement after wifi5 was simply higher frequencies (pointless since your internet pipe is still crap) and more power (by relaxing power limits). really nothing else because even the features that were standardized might not be present or be badly implemented anyway, like half wifi6e routers not even having a 6ghz radio.

Of course, bumping transmit power on the AP does little to help poor little mobiles that can't transmit back.

Sure, you get 5 bars of signal strength indicated, but your TCP performance is still garbage.

Because its not illegal?