when I can use boot camp with m1 chip?

even if ms let people purchase their arm windows version other than OEM

then if it was for the purpose of gaming then it would likely not work, ms's x86 emulation seems to perform a bit worse than rosetta stone 2 and even with that i would not expect that great performance on x86 compiled games on an m1 cpu

I guess that would be a question for Apple and Microsoft. We users have no insight into neither company's future plans/policies.