I think you can argue that this is largely offset by the opportunity the web as a platform can offer you and your games. Theft of assets is definitely an issue

I think you can argue that this is largely offset by the opportunity the web as a platform can offer you and your games. Theft of assets is definitely an issue. We've actually been targeted ourselves by someone stealing and reselling our product. It's a pretty upsetting and difficult situation so we sympathise with the concerns. What we learnt from our experience however is the thief was largely incompetent and didn't actually pose as much of a risk as we thought he would to our operations. I think often the same can apply for theft of assets, it's upsetting that someone steals in in one swoop without any thought and appears to be making money from it, but most of the time they are struggling to make anything at all from your work. If someone more successfully is stealing from you there are a lot of options to take it further if it becomes economically viable. For the majority of developers though I don't think it's as big a concern as many people think it is. Although I'm sure there are some good counter examples and arguments against this.