The GPL specifically says it has no bearing on you *using* the software, only if you change it and distribute your changes does it bind you.A EULA in effect says you can't do A, B, and C, it takes *away* rights copyright law would otherwise give you.
A copyright license like the GPL says you *can* do A, B, and C because the copyright owner is giving you *additional* rights beyond those denied you by law.
Don't be fooled by the word "license" in the EULA, a EULA is a contract, the GPL really is a license.
