I hope what that what quote-unquote seems to you is actually based off of a serious research.

On top of that, what if you brought someone via your facebook or twitter posts. Would that still count?

Who knows is it possible to use not only ETH but also other currencies?

They said they would add support for other currencies but not until their customer base grows.

Great to know, thank you.

Whitepaper:
"Advantages of investing in XWIN:"<..>"2. Early access to the market. The undisputed advantage of XWIN is its early access to the market and penetration the main part of the market, efficient commissions, and great competitive advantages, the undeniable right of the first;".

That's because they are being checked by people I guess, maybe devs will be able to automate the process in the nearest future.

I can assume that XWIN is not created for this, it has another advantages and objectives.

As I understand no, XWIN's ethereum blockchain system is intended only for ETH (what seems logical).

Well, then we can sum up and say that devs chose this cryptocurrency and technology for this project for some reasons.