Blizzard
Whether it’s Overwatch, World of Warcraft, Hearthstone, or any of Blizzard’s other games, they’ve always received excellent post-launch support from the team. While Overwatch continues to bring new characters or maps every so often completely free of charge, Hearthstone receives free updates for balancing and still offers paid content for those die-hard fans.
As for World of Warcraft, Diablo III and Starcraft 2, each and every one of them has received some form of update, be it paid or free, that has breathed new life into the standard mechanics of the game on its release. What’s more, any paid content (barring few exceptions) has been received incredibly well among fans and critics alike. It’s Blizzard’s understanding of what their fans want, and their constant efforts to offer the best content for a reasonable price that helps to see their games stay relevant for far longer than many others on the market.