My comment was specifically about bridges and multi-platform clients. That's what I think doesn't work and is a waste of time. One-time migration tools make sense, but that's a little different story for me.
For example, Matrix protocol has a lot of bridges, but that hasn't helped with adoption much. Similarly, on Bluesky, there is Bridgy Fed to connect to Activity Pub, but I don't think that has had any major impact on growth either.
I feel like bridges like this are helping more the larger network become even more dominant, instead of helping smaller networks grow... so maybe it's counterproductive in some way.