The point of an architecture license is that you license the ISA itself but can design your own chip from the transistor up :) There's like 15 holders of ARM architecture license. As long as Apple properly implements the ISA and passes validation, they can literally do whatever they want to the core itself (not just the SoC around it).

Most ARM users have much more limited licenses, and can only buy and fab IP blocks designed by someone else (usually ARM).

That is the case of Amazon, the Graviton used A72 cores, and the Graviton II uses Neoverse N1, which are derived from the A76 with more focus on server workloads.

Both are designed by and licensed from ARM.