There is a LOT of evidence being gathered (sadly only by individuals, though to me they are more of experts and reliable analysts than the ones people usually see as more reputable) to show that a lot of ways exist that look suspiciously like manipulation, with Tether right in the center of these claims.

Of course, the printing itself of Tether does not necessarily mean this is the only thing driving prices but when you have exchanges behind Tether, you must be able to be skeptical of how it is used as a tool to move prices easily.