Sure I agree they have no incentive to promote them. But your claim wasn’t that they don’t promote them. You claimed that they’re making them exceedingly difficult to install. Apparently because they put the command for that in a consistent menu position for decades and removing the functionality temporarily in a single jurisdiction.

If they wanted to make it “exceedingly difficult” they could be disabling it in all jurisdictions, or hide it behind layers of developer mode dialogs and warnings. They could remove the instructions for how to do so from the on device help. They could require you to re-pin it every 3 days like they do for self loaded apps. They could stop adding support for newer PWA APIs as new ones get standardized and they could deprecate and remove APIs that already exist. We all know Apple isn’t precious about backwards compatibility.

If the goal is to make using a PWA “exceedingly difficult” Apple is failing miserably despite being very successful at making side-loading apps “exceedingly difficult”