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of course, i understand that, but I mean why DGB and not any other type of ALT coin

I would guess that the establishment has to open a wallet on an exchange, in this case probably litebit, and set up their software for it. For whatever reason, they picked DGB, and now RADS. I just checked DASH vs DGB on coinmarketcap for the volume traded on that exchange and it's much higher for DGB. That might be part of the reason.

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