Only M3 was made with this latest 3nm process. However, M1 and M2 were produced using N5 and N5P respectively. Samsung, Qualcomm, AMD all have access to 5nm processes. In fact Samsung fabs their own 5nm chips while AMD's 7000 series / Zen4 chips were fabbed using the N5 process. However, they are not nearly as competitive as Apple's chips. The whole premise of "Apple's M series chips are only fast because of the process is incorrect".

During the M2 series Apple had a node disadvantage compared to AMD and Apple was still ahead.

Being the first to buy 3nm doesn't prove what was initially claimed.