Citing supply chain sources, Taiwanese outlet Apple Daily predicts that AMD is set to become TSMC's largest 7nm customer by the end of 2020, displacing Apple in the process. The spectacular success of Ryzen and Apple's move to 5nm are likely reasons.
https://www.notebookcheck.net/AMD-set-to-become-TSMC-s-largest-2020-client.449040.0.html