There are so many ways to benefit. I've never owned an Apple product in my life! And yet, I own an AMD CPU that was built on a TSMC process. I feel like that benefits me. Would that TSMC process be as good if they didn't have Apple as a customer? Maybe not. I don't know for sure - it's not something I obsess over.

It would be different if the products you could buy outside of Apple were actually bad. (And for some people who want fanless Apple Silicon, a lot of laptop alternatives are bad, but for my needs, both desktops and laptops with fans are fulfilling my needs and wants.)