Steam won't lose access to the market, this will just be a hiccup
- some people with credit cards will use them
- some people will get credit cards just for this purpose (and then end up in debt)
- some people will just wait to see what happens
- steam will open this up to other verification methods (good, or bad)
Any customers that steam loses due to this, will be quickly replaced, large companies are generally not overly worried about losing customers due to new customers being born every single day
"This is the first decent-sized site to show this level of resistance to the policy." What?