download – Why streaming service web apps won’t implement an offline downloading of the content yet, in the browser?

Not really fully knowledgeable to web development, just curious and asking.

Why won’t Netflix (and other streaming service website, web apps like Disney+, HBO Max and Apple TV+) won’t develop an offline downloading feature on their web apps yet.

Is that currently technically infeasible right now based on the current web, DRM, platforms, browser standards & tech right now? Or can it be done?

Like storing encrypted DRM content on web app storage right on the device? For offline or later use? Password Managers can currently do this right?

Also, is it the same situation with these streaming service TV apps as well, which is mostly prepacked HTML5 / React web app on these Smart TV platforms?

So is it a technical hindrance question right now, or just a