My parent's objection was that eBay was a monopoly, and as the only place to buy or sell used books they should face higher scrutiny. I pointed out that Amazon

My parent's objection was that eBay was a monopoly, and as the only place to buy or sell used books they should face higher scrutiny. I pointed out that Amazon is a serious competitor of theirs; eBay is far from the only place for used book selling.