By Foo Yun Chee BRUSSELS (Reuters) -Major online platforms face a fee up to 0.1% of annual net income to cover the costs of monitoring compliance with new European Union rules requiring them to do more to police their content, an EU document shows. The Digital Services Act (DSA) rules are likely to be agreed between EU countries and lawmakers later this month. Levying such a fee would be a first for the European Commission, which is the EU’s executive body. “The overall amount of the annual supervisory fees shall be based on the estimated costs the Commission incurs in relation to its supervis…