Any post and community could be accessed through a theoretically limitless amount of instances, which also means a theoretically limitless amount of URLs.
Will this hinder Lemmy from ever coming into the mainstream? If I type any topic in Google, I will get a reddit thread that deals with that. Can something like that ever happen for Lemmy?
The only ones I found allow you to search for instances and/or communities. I haven’t found anything that can search posts, yet. Well DuckDuckGo can but you have to add some elaborate query syntax to make it work. And even then it doesn’t know your instance and can potentially pick up duplicates.