Considering the insane amounts that companies go after individuals for where the power dynamic is reversed, then hell yes he should go after them for as much as he can. Whenever individuals do something wrong, no matter how minor, companies go after them for huge amounts way out of line with actual damages. They have the lawyers and the time and the money, and they use it to abuse those with none of those things. If the situation was reversed I have no doubt the company would be going after him for as much or more. But when the dynamic changes, and companies use things from individuals, they tend to abuse the shit out of it again, 'forgetting' to take things down, using without attribution or permission, or just straight up stealing work and IP. And then again, they have the time, money, and lawyers to get off easy, because most individuals they screw over can't afford to go toe to toe with them for as long as it takes to get results. I don't think this is right, by any means, by either the individual or the company. But while the company can and does do it, then what does the individual get by not acting the same way? The moral high ground is great, but in cases like this it doesn't make you a living. You just end up poor with your hard work being ripped off left and right. Screw that.