Apple's walled garden and mob tactics pissed DHH off [1-3]. Of course he's going to advocate for alternatives.

Tim Sweeney is in the same camp.

[1] https://www.hey.com/apple/

[2] https://world.hey.com/dhh/apple-rejects-the-hey-calendar-fro...

[3] https://world.hey.com/dhh/hey-is-finally-for-sale-on-the-iph...