I assume you’re phrasing this as a question to challenge what I said regarding main stream search engines.

It is possible to get a random hit on Lemmy, as instances are crawled like any other webpage. Just like you might get a Mastadon hit every once in a while. However they will not rank very high and almost always be buried a few pages in, while a Reddit post will rank much higher for the same search.

It’s the natured of how federation works and search engines don’t account for it. You can increase your chances by including a specific instance name or the word Lemmy.