S2 just announced a change in their f2p model. So far the plan is to have 30 core heroes available always, making all gamemodes available to everyone as a result. They also gonna make it possible to upgrade to legacy. They taking additional community feedback though so there might be a few changes.
In other words they want to improve upon an old outdated f2p model. They have the balls to do so.
The main difference between S2 and Riot/Valve is they aren't afraid to take risks and try something new.