Not that any of us would know for sure but my guess is there if you talk to a lawyer in each country (and I’d recommend talking to one in yours) that they are going to give you a different answer. In some countries it might be legal to forgo your rights and operate on other laws for things like refund policy and tax (though I doubt this one). But at the end of the day I’m not sure that matters, lets say Epic denies you as a customer a refund and your local law mandates one (I know you said your Swiss but I’m writing this generic for any country). You’ve agreed to the EULA but your country might define those rights as those you cannot agree away (there also might be an international agreement in play ). So essentially there would have to be a class action lawsuit in your country to fight for those rights so Epic can be held accountable. Then there is the fact Epic may or may not have even have much to go after inside that country even if held accountable. In very small markets (lets say some tiny imaginary island with only 10 people) it doesn’t matter especially since this is an online business (because even if found illegal there it would just be ignored with no consequences). Large markets will almost always be eventually have local law obeyed because the market is lucrative or the consequences are high.
Most companies will write there EULA like it is binding everywhere and wait for others to tell and try to enforce that they can’t do X or Y before they change. Is it legal or not depends on where you are from but it’s generally mute until it goes through a court or becomes obvious what the answer is in your local country from others going through their lawsuit.