"Although The Elder Scrolls Online is free-to-play, it still has an optional, paid subscription that essentially works like a season pass for all DLC."

That's not entirely accurate. TESO is 'Buy-to-Play', with an optional paid subscription that essentially works like a season pass for all DLC.

'Free-to-play' denotes that a game is free to download, and play, with optional 'pay-if-you-want' services. With TESO, you have to purchase the game to play.

I know it seems to be a minor terminology nitpick, but it's actually an important distinction between two different business models, especially for readers who may not already be familiar with TESO.