I really don't get the recent hype around this topic. Sideloading pirated apps on android is a click on a button and a checkbox. Solving it seems close to impossible, without seriously compromising the users freedom to install apks and privacy.
Apple on the other end has a finite list of issued developer certificates and an even smaller list of enterprise certificates. If some are abused, it's as easy as revoking them, given iOS regularly checks the OCSP.
I guess they just spy less on their users, which for example means iOS might not phone home telemetry data of every app an user installs, which makes it harder to catch abuse immediatly. Also since taking down a small number of pirated apps might not directly translate into an equivalent revenue in legit app purchases (as the industry might claim), I guess there isn't too much of an economic incentive for Apple to enforce their TOS immediatly.