The client is nothing but a display. All it downloads is vid and all it up loads is control. The only actual issue is potential for lag. ag is solvable by designing with it in mind.
Think about things like stadia. If they are viable so is actually running the game on the server. This way all the activity is server side and everything coming from the client is validated.
The actual issue is that the game servers and networking would be more expensive. And that is the real reason they do it with DRM, it is cheaper for them. Your experience is not important to them.
The lag issue is really one of design and cheap server side infrastructure. A shooter would use a time stamp to allow position validation for when the shot was fired. Simply reduce the micro management and you've resolved most of it to start with.