The problem with tether is a lot of crypto use it as sort of an "on-chain peg" and some people trade "real value crypto" (bitcoin) for tether. It's not a problem until the actual tether holders can't cash out to fiat.
The secondary effect is that tether may be pumping the price of all crypto everywhere because it's so ubiquitous.
Do I have this right? I'm mostly stuck on the "value" of tether beyond some sort of "accounting" or "tax avoidance" (no judgement here, trying to figure out why ppl would have tether's instead of "actual crypto".