Bluesky is where a meaningful slice of the technical and startup audience moved, and its feeds are still small enough that a good reply is seen rather than buried. The trade is reach for signal: fewer people, far less noise per post, and a much higher chance that the person you answered actually reads it.
Bluesky’s developer guidelines restrict automated and bulk replies, and the culture is less tolerant of marketing patterns than the size of the network suggests. Custom feeds mean a bad pattern is visible to everyone following that feed, not just to your followers.