There are rights and responsibilities associated with a proprietary model… and IMO you (and your permissive government) should not be overriding those rights for your own short-sighted benefit.
Kind of sounds like you misunderstood the initiative to be honest. This only affects games which have been abandoned by the developer, the proprietary model stays perfectly intact as long as you actually keep selling your games.
PSA if you are worried about link parameters giving away where you came from, you should really be worried about HTTP Referrer headers, which are of course turned on by default in most browsers. Be advised turning them off may break some (parts of) certain websites, but most still work fine in my experience.
In Firefox go to about:config page and set
network.http.sendRefererHeader
to 0.