He never said anything to my knowledge, the apollo dev said he discontinued it.

Hope Boost dev makes his app open source

What did he change his mind on?

No idea. He didn’t say much at all up until very recently, when he made a post confirming that Boost for Reddit was shutting down.

As far as I knew, he had given the impression he wasn’t interested in migrating his app to Lemmy, but apparently that’s not the case!