More than likely it's because someone complained about the card being misused at a tournament. Either that or the creators of yugioh decided that the card was to overpowered to be used in tournaments and should only be for collecting purposes only
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No. But if there is, it is probably already banned.
Monster Reborn isn't banned. It is a limited card (meaning only one may be in your deck). It was banned for about a year or two but it has recently been limited.
It is limited(you can use 1) but not totally banned.
No. The Yu-gi-oh card maker is just for fun, and not officially affiliated with Konami (the company that owns Yu-gi-oh). You can just make cards that look like it but you can not actually print it like a real yu-gi-oh card.
It is currently banned in Advanced Format, and restricted to 1 in Traditional Format.