[gruez]

>Toilet paper started becoming available at stores again pretty much immediately after those sites started cracking down on this practice

It's premature to assume that the return of normal supply was due to crackdowns of reselling on online marketplaces. There were a bunch of other factors that changed in the same timeframe

* stores imposed per-customer limits

* prices went up (both in terms of absolute prices, and discounts disappearing)

* as hoarders stocked up, their demand also went down(if you just bought 18 month's supply, you'd be less inclined to buy more)

* people were being assured by the media that there won't be a TP shortage, which probably decreased the amount of panic buying