Consumers are revolting against payment processors who seek to ban adult-themed Steam games, movies, and art. A Change.org petition aimed at Visa and Mastercard is rapidly gaining support. Its organizers also wish to limit the power of activist groups that influence these companies.
Most do, Steam accepts a fair few regional ones like the Dutch iDEAL. But it barely matters if a lot of people pay with Visa/MasterCard instead.
Do you have to somehow enable them? There is a common standard for paying directly from your online bank here in Finland, but Steam doesn’t seem to support it.
Might depend on the market. The Finnish market is not even a third of the Dutch market, so perhaps it’s just a business decision whether they support it or not. They do support iDEAL without needing to enable anything.