>>715712303in a legal way, no, obviously no
but in a practical way, as i already said, visa and mastercard are the only legit options available or practically viable in many countries, and valve isn't going to randomly cut off several countries from buying steam games
In my country, and also in nearly all european countries, visa and mastercard are the literal providers for 90% of the other payment methods available, and the other options are way worse.
PaysafeCard involves several overly complicated hoops to get your money on, and even when you manage to do it, 7-8 times out of 10 the payment fails when using it on sites.
JCB involves fees that make it idiotic as an option(want to recharge 5 euro onto it? cool, pay 2-3 euro recharge fees cause we say so, want no fee? recharge at least 50 euro, oh and also your local store wont accept JCB as payment so fuck you)
Skrill has the exact same issues as PaysafeCard
so while it is true they are under no legal obligation to use visa and mastercard, those are the defacto payment methods 90% of steam users use on a daily basis, so valve deciding to not using them = valve deciding 90% of their users cant buy games