[joe_the_user]

The thing about bubbles is being small allows you to pull in fools at a rate sufficient to maintain your price. Once you're large, you can run out of fools since you're a large percent of a given market.

That said, my vague understanding of Tether is that since it's completely opaque and basically rigged, rather than collapsing entirely, the controllers of the "currency" can make it gradually harder for just select customers to remove their money and so support its apparent value without it seeming to collapse (I remember an article a while about a guy who couldn't redeem his tether for reasons unspecified by whatever the exchange, etc).

[roywiggins]

But if they prevent some people from redeeming, some of those people will go to exchanges and sell for other coins, putting further pressure on the price.

If Tether wants to maintain the peg they have to keep letting people redeem as long as there's more sellers than buyers.