Intel has to work with them. Intel was under the religion of x86 everywhere for way too long.
At this point Apple won't work with Intel, because their M1/M2 is so much better than Intel's chips, why give them process experience and transistor-level knowledge of how the M1 is structured, designed, and performs?
Apple probably has the TSMC execs fully adapted to their culture of secrecy. Samsung and Intel would probably never cave to that properly: Samsung is their main smartphone competitor, and Intel is their competitor in desktop and probably ARM in the future.