Username or EmailPassword
the fact that EULA's in principle are deemed legal does not mean that all EULA's are legal or that all clauses in an EULA are legal.
True that. The legal principal is called "quid pro quo".
Wiki: Quid pro quo (From the Latin meaning "something for something") indicates a more-or-less equal exchange or substitution of goods or services. English speakers often use the term to mean "a favor for a favor"...
...If the exchange appears excessively one sided, courts in some jurisdictions may question whether a quid pro quo did actually exist and the contract may be void by law.