Well, not every Sega game. Every game that was on a Sega console.
And this is why Sega's cool nowadays. People want to make a sonic fan game? You're hired. Want to play all our old games? Here, have them all for free.
Where Nintendo... Metroid fan game? Shut it down. Wanna play our old games? Here's 12 of them, again, now hand over the money.