Ostensibly they are similar but there are some old threads also about how [bluesky TOS gives license to all your content](https://news.ycombinator.com/item?id=3

Ostensibly they are similar but there are some old threads also about how [bluesky TOS gives license to all your content](https://news.ycombinator.com/item?id=35755501 https://news.ycombinator.com/item?id=35755501). Also, Bluesky is run by a private company. Mastodon and Bluesky have different ideologies behind them.