Even NewEgg sells on eBay, and they have their own website!
There is something to be said for the stability of marketplace rules and ecosystem. No rules are perfect, but if the rules are stable, people eventually learn how to interpret signals and assess risk. If the rules are constantly changing, all that hard-earned customer knowledge is discarded at random intervals, because the platform vendor has silently forked/rebooted the economy into a parallel universe. Now you have sellers in the new universe and buyers in the old universe.
In a sane regulatory environment, platforms would be forced to put a version number on both the UX and ToS, so people would at least know the universe/rules have changed. As with other mandatory reporting, metrics on public notification would reduce "universe churn" and make it part of the marketing/competitive landscape.
There is something to be said for the stability of marketplace rules and ecosystem. No rules are perfect, but if the rules are stable, people eventually learn how to interpret signals and assess risk. If the rules are constantly changing, all that hard-earned customer knowledge is discarded at random intervals, because the platform vendor has silently forked/rebooted the economy into a parallel universe. Now you have sellers in the new universe and buyers in the old universe.
In a sane regulatory environment, platforms would be forced to put a version number on both the UX and ToS, so people would at least know the universe/rules have changed. As with other mandatory reporting, metrics on public notification would reduce "universe churn" and make it part of the marketing/competitive landscape.