I’d imagine you’d need a browser that has developer tools, which is far less common on mobile. A simpler solution would be to use a separate app that just takes the page URL and downloads the video for you, such as this one: https://f-droid.org/en/packages/com.junkfood.seal/

It’s not something I’ve used very much as I don’t have much need for it, but I have used Locus a few times and I’m pretty comfortable with their privacy policy compared to the vast majority of other options.

There are options that don’t use Google et al.

It sounds much better when you say 1 in 167 people then vs 1 in 25 people today.

There are plenty of options for both software and OS, so not every combination is going to have the same level of support as Windows, where every user gets the same experience.

That said, I’ve heard lots of good things about NoMachine.