ha, no.. bluesky is not open to federation. they control the only router and do not allow connectivity to routers not controlled by them.
there isnt a single non-bluesky controlled instance that can federate natively with bluesky.
bluesky is just twitter with a little more user-controllable data sourcing. not that theres anything wrong with that, but its certainly not a part of any federation.
lemmy is part of a horizontally scaling network of instances (servers). if a popular community on an instance goes sideways... say because of a new terrible mod or rule change, the entire population of that community can up and move to a new community in another instance without having to create new accounts anywhere.
a lot of lemmy instances block google indexing purposefully. you would need to search using the instance search capabilities.