Append “_nomap” to the end of your SSIDs to instruct Google not to use your wi-fi access point for their mapping services.

To do the same for Apple, add “_optout” to the end of your SSIDs¹.

To boycott both, the rumor is that Google’s “_nomap” must be last, but Apple’s “_optout” flag must be in the penultimate position if and only if Google’s token is at the end. So you might have an SSID like “boycottCloudflare_optout_nomap” to boycott the baddies, for example. But note that “boycottCloudflare” is merely symbolic, to raise awareness of the web’s most harmful enshitifier.

¹ sorry to say I have no reference to cite for the Apple rules. It’s just a rumor.

update

The Apple opt-out procedure has apparently changed to align with Google. Someone refers to this page for Apple.