Tether is now playing on the high leagues, i have been looking at this for more than days, and they are doing it by the wrong way.
They were just a project to be the "fiat" of the cryptocurrencies, but they are now playing like a big boss, maybe it is a good thing, but it is not upto them, they can not just stop that rally.
And in the moment that they touch 900 million dollars of marketcap, that coin is going to collapse, i dont know what is going to happen, but there is no way that they can "print" or just release more tethers (usdt)
If they pump bitcoin cash artificially, then Bitfinex can take the Tether intervention into consideration. We can't oppose this action. They play with bitcoin cash, then bitcoin's players can play with bitcoin too.
Some BCH fans thought bitcoin is vulnerable to BCH attack and there is no group/person behind bitcoin to back it up. But they're wrong as seen.
As long they back that tether with usd, there won't be any problems.