It's amusing that people think that a two-year lag in licensing is enough to thwart the so-called freeloaders.<p>It could take way more time than that just for you to get noticed and have any users at all.<p>If your popularity starts 8 years from now, and your license converts to BSD-like or whatever 2 years from now, that's as good as just licensing it that way today.<p>I think how you want to work this is that the license goes free N years after the estimated date when you hit a base of M users.