I understand that, but what I'm not understanding is why this seems to be a concern. I suppose equity given to early employees is a problem too and they're just "dumping their bags on retail" after their lockup period expires?

Earlier stage investors take risk and are rewarded for that. Most companies go bankrupt and folks lose their principal. For the companies that are successful yea some go bust after IPO - so what? Are you against public markets or something? That would at least be an interesting discussion.

Google IPO'd in 2004 and returned from what I'm reading about 6,500% after IPO (and this was in 2024, so the gains have gone up much higher since then) and all of that was the bags dumped on retail. If someone wants to dump their 6,500% return on me I'll take them up on that all day every day and twice on Sunday.

Being cynical is a recipe for poverty.