I think that Lemmy does need more of the right exposure.
If you search for any Lemmy content on Google or Duck-Duck-Go, you don’t get any good results. This is probably because most people use Apps or secure browsers that don’t allow tracking.
Most likely not feasible, because what the bangs do is passing site:domain.com to the search result. As you know, Lemmy does not have a singular domain name so this won't work for it. As a matter of fact, there is a bang for Mastodon, but it only searches the biggest instance, mastodon.social.