It's really not that complicated. Use google if you want more info than what follows.
Tesla has its own proprietary fast-charge systems, yes. I won't talk about them. There are currently TWO (non-Tesla) standards for fast charging : CHAdeMO and CCS (Combined Charging System). CHAdeMO was developed in Japan, and most Asian companies make cars with CHAdeMO fast-charge ports (world-wide). CCS is an international standard, and every other (non-Asian) car manufacturer uses it. CCS is named "Combined Charging System" because it combines the standard Level-2 plug for 'regular' charging with two additional high-amperage/high-voltage DC ports for fast charging. You only need one plug with CCS (whereas a car with CHAdeMO has two : a level-2 AND a CHAdeMO plug). A vehicle comes with either CHAdeMO or CCS, not both.
ChargePoint and EVgo have both CHAdeMO and CCS fast-charge stations, it is not as if each picked a different standard. In fact, most DCFC (DC Fast Charge) stations being installed in the U.S. today have both types of plugs. Most currently installed DCFC chargers are 100-125Amps, or 50-60Amps, at around 400/500V (that's about 40/50-50/62 kW or 20/24-25/30 kW, respectively). The two standards (CHAdeMO & CCS) are rated "theoretically" up to 200A, so 80 kW chargers have been "theoretically" possible for a while. I seem to recall reading recently that CharIN (the CCS standards body) announced a 150 kW "tweak" (small spec change) to the CCS standard, available immediately, and that they are currently working on a much more robust 350kW standard. EVgo announced that it "will be" installing a large charge station (multiple charge spots for multiple concurrent car charging) near Bakersfield, CA - opening this summer, with 150 kW chargers. Or maybe it was ChargePoint. Or both (both *have* made announcements). There was a Swiss company that announced installation of a few 100 kW chargers last year.
At any rate, today there are almost NO (non-Tesla) fast chargers available in the U.S. that charge at over 50 kW. (I read that last month a 150 kW charger was installed near San Francisco at an EVgo station "for testing".) Almost no (non-Tesla) cars are on the road that will charge at a rate faster than 50 kW (Bolt, Kia Soul may be the only two). Any vehicle that has a 35 kWh or smaller battery really doesn't need to charge at a rate higher than 50-60 kW anyway. So you save 2 minutes - big deal.
PS : Yes, there's a third fast-charge standard : GB/T. But it's only used in China, so who cares!