Why is gfn asking for 5GHz?

Question

WiFi

Gfn - GeForce now, a streaming gaming service, the description says you need 15 Mbps of the Internet, but optimally 25 and in every possible way they persuade you to use a wired connection or 5 GHz WiFi, googling the difference between 2.4 and 5 GHz, all 5 GHz are credited with only one advantage - that it supports high speed transmission. But I still don’t understand why they need 5GHz if it doesn’t inflate my 60 Mbps to 120.