Free 100% customizable site with Google

So I came across this video today for hosting a webpage in google drive,
(Youtube vid ID= dR8bvDlZUBU) and ended up setting up my very first page that I've 100% coded by myself in HTML.

Some questions:
Does someone have an idea how to make the URLs look less shady? I have no idea how this works, or even how URLs work at all
Could this support large amounts of visitors?
Does this have other limitations compared to paid hosting?

Not sure on the amount of traffic that it would support as that is not the main design of google drive.

You might try getting a domain name and pointing it to the link and mask it. Not sure never tried it nor plan on trying it.