Unfortunately, that’s the world we live in. Those EULAs are about insurance, lawsuits, and saving money. It’s not about them wanting to own your stuff, per se, it’s about them having defacto permission to use your stuff for their own promotions without having to pay you. It’s about keeping you from being able to sue if they use your stuff without paying you for the rights.
It’s up to you, of course, but I’d say, don’t worry about it. All corporations have similar EULAs. It’s scary because it’s you as an individual being at the mercy of a corporation. Well, we all are all the time, so it’s not like you’re wandering into new territory. They could do the honest thing, the thing corporations used to do, and pay you for using your stuff in their promotions, but that ship sailed sometime in the mid-70s.
If you ever post your finished stuff to Youtube, Facebook, etc. you’ll be dealing with the exact same type of EULA. The only way to avoid such a scenario is to never post your stuff anywhere, ever.
