You don’t even need to ban it. You just need to open up the marketplace to alternatives. Cory Doctrow has been pushing the idea that the best retaliation is to simply repeal anti-circumvention laws and allow companies to begin chipping away at the walled gardens of the tech giants. For example, John Deere famously puts software locks on its tractors so that even simple repairs require the owner to pay for a technician to come out and “authorize” the newly installed part or else the machine will refuse to start. This system could almost certainly be bypassed, but right now the law not only allows manufacturers to lock their tractors, it also forbids anyone else from unlocking them. If the EU simply repealed the law that bans circumvention then some clever EU citizen could legally reverse engineer the software running on those tractors and start a business selling unlocking software. They could make it a one-time purchase at 10x the cost of an official tech visit and make money hand over fist while still saving their customers time and money in the long term.
And of course it’s not just tractors. Make a third party app store for the iphone that charges half the commission of Apple. Make a tool that allows seamless account migration from Google to the independent cloud provider of your choice. A huge amount of corporate rent seeking is enabled by anti-circumvention laws.

Time to once again pitch my idea for a Super Smash Bros style fighting game with all public domain characters and a new DLC released every January 1st.