Of course.... but who pays (and for what, exactly) is somewhat immaterial. You're able to post public links to files and get (effectively) unlimited downloads via Dropbox too. It was a counter-example to your Google.com/yourdesiredfile
Who pays (and why) is hardly immaterial when it has a defining effect on how the site is actually used. There's a good reason as to why Google and Dropbox can easily claim legitimacy while Mega has to struggle.
No, no you can't.
There is a wildly obvious difference here and unless you're being deliberately dishonest, you'd have to be a complete idiot not to see it.