The problem is that those "few countries" are 149 out of the 203 sovereign
states in the world, at least in theory. In many of them, including my
home country Sweden and most of the rest of the EU, software patents are
valid and are regularly granted, but you can't enforce them in court,
making them mostly useless. However, there are talks of making them
enforceable in all of EU in the near future, and while such plans has been
beaten back before, there are no guarantees that will happen this time, or
the next time, making betting on the status quo quite risky...