Here's an idea: how about charging more for European users to access your site. If it is a cost issue, how about reflect that cost in the price of your service.

Here's an idea: how about charging more for European users to access your site. If it is a cost issue, how about reflect that cost in the price of your service. So, if your web app is free for North American users, put it behind a paywall for Europeans. It's not ideal, but maybe if enough sites/services did that, it would help reflect the reality of the situation. Consider it a European service tax.