Will we have a legal guarantee that you aren't accessing and selling data from our machines? A kernel-mode driver is God mode access for most people (who don't run virtual machines, or OSes other than the proprietary ones in their processor/baseband).
Additionally, what can you say to reassure us that your kernel driver will have a small attack surface? Building a driver meant to hook and examine memory access is basically malware by another name, and it would be very convenient for a malware dev to exploit a prebuilt driver like this, particularly as Windows has increased restrictions even around Administrator accounts.
I do understand why anti-cheat needs kernel mode drivers, but that definitely doesn't mean I like it. I also can't help but worry about a company owned by a company that famously does siphon up user data elsewhere (that is, Riot is owned by Tencent).