For example GOG is a successful DRM free distributor - they only accept DRM free games from various publishers. There are others as well (for music, e-books and etc.). It's mostly video industry which lacks DRM-free distribution options (services like this are virtually non existent worldwide: https://www.headweb.com/en/ See their DRM-free terms of purchase: https://www.headweb.com/en/100237/purchase-terms).
Supporting unethical practice can't be excused with fear of going out of business by the way. Also, publishers need distributors and users not any less than distributors and users need publishers, if not even more. Therefore voting with your wallet (on either distributor or user level) is not senseless. Except that distributors have more leverage on publishers, because of their scale, in comparison with an individual who buys only DRM-free products. Therefore distributors can be blamed more for DRM proliferation.
Supporting unethical practice can't be excused with fear of going out of business by the way. Also, publishers need distributors and users not any less than distributors and users need publishers, if not even more. Therefore voting with your wallet (on either distributor or user level) is not senseless. Except that distributors have more leverage on publishers, because of their scale, in comparison with an individual who buys only DRM-free products. Therefore distributors can be blamed more for DRM proliferation.