http://writeasw4b635r4o3vec6mu45s47ohfyro5vayzx2zjwod4pjswyovyd.onion/matt/identity-in-the-fediverse
So for example, if I wanted my primary identity to be a Mastodon account, I could also create a PixelFed account like normal and hook it up to that Mastodon account. In this scenario, PixelFed would let me turn off publication of any ActivityPub endpoints (so people aren't also following my PixelFed account), and would simply interact with Mastodon's API as a client.