It’s not just the resources to mirror posts, it’s also the resources to keep up with communicating with the community, answer questions, maintain a positive presence. It’s not trivial.

I do sort of agree that it’s insane for any privacy company to be emphasizing Reddit over Mastodon. If anything, the limited resources should motivate them shutting down Reddit and keeping Mastodon. But it’s not as totally stupid an explanation as it might seem.

It’s also notable that Reddit’s features make it a lot easier to communicate with tons of people in a genuine way, with minimal effort (since it’s good at surfacing high-voted comments and letting you engage with those people). As well as making it easy to silence anyone who is saying anything you don’t want them to say, of course.