This is basically the crux why capitalism is inherently unfair, anti-democratic, and does not distribute wealth based on value in any way shape or form.

This tool is only paid such a figure because he was a member of the founding group, and continued to hold on for 15+ years. He may have been pivotal to their success, or he may have been an idiot that held them back for 15 years. Either way, after the initial x number of years, and y number of employees get involved, whatever value he provided is gradually diluted by the pool of employees. In the case of Reddit this effect is multiplied, as the mods and users have generated 99% of the sites value for the majority of its existence. They could have added zero features for the last decade; just focused on engineering problems to do with scaling, and the site would've prospered.

None of this matters to capitalism, as it distributes wealth (value) based on a range of convoluted claims to contracts and ownership, designed to overwhelmingly bias pre-existing capital; people who were born first, the luckiest, whose ancestors were the most cutthroat and ruthless (e.g. monarchs, lords, landowners, the church). It doesn't have anything to do with actual value to society, or even within a specific business.

He feels entitled to their labor for free, simply because he thinks he deserves free labor.