Do it really works: Theoretically YES. Practically, I didn't try yet. Why I didn't try? Cause it needs something I don't have already, I need to get that first, then I can try it.
What it needs: An android phone and "another thing". What's that thing? I don't want to reveal here, cause that will give out the method I guess. Is it very difficult or something very special? Nope. It's a very common and usual and cheap (sometimes free). But not everybody and in every country you can get that so easily as OP getting them.
Is it worldwide: Not sure, as OP is in USA and did this in USA only, he did not tested this outside USA yet. Moreover, this is very easy for OP as he is getting that "another thing" FREE as much as he want - but it can't be FREE for everybody and in every country. Though it's not expensive either, it is usually cheap. However, youtube red is also 10$/month and that "another thing" can cost sometimes almost that amount or more in some countries.
Is it FREE as OP claimed: Yes for OP and for those in USA and may be in some other countries. For most of rest other countries, it's not FREE, but should be cheaper than 10$/month youtube RED cost. But in some countries, it can cost you almost same or even more than youtube's official cost. Moreover, you'll need the consistent supply of that "another thing" in regular basis, as after a certain time period, you'll have to re-do the process.
Ease of use: As you have to get that "another thing" first to make it work, it's not something you can just do in few minutes from scratch. Once you get that, it's easy to do. Though it's not set-n-forget forever thing, you have to re-do the whole process after a certain period.
Conclusion: This is not something magic method, there are work you have to do and you need to get that "another thing" to make it work.
according to this vouch I will not try to get it as I don't live in USA and that "thing" is probably won't be cheap in Libya... well, hope you get some buyers OP