Maybe that's why he's selling lol. That, or the fact that tiktok is working on an ad system similar to youtube, which will let the influences make money. That'll kill this.
They had considered selling at one point because they feared Instagram was going to shut them down with legal force. They clear nearly a million in revenue before FB legal team showed up and told them to cease and desist.
They closed shop, took their excellent profit and went on to found actual enterprise software.
TL;DR OP probably wants to sell to not have to gamble with legal coming after them as they grow.