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Its not that at all. Its that there is currently no way to group similar communities together into a single feed. So users have to go to each community individually rather than being able to see multiple communities with the same or similar topic in a single place.
Don’t know about Jerboa, but Connect for Lemmy has a feature that you can type in keywords you want to use as filters, and posts with those words in the title are automatically hidden.
I use it to filter out political posts, and after using it in this way my Lemmy experience has drastically improved. You may be able to use it in a similar way for spider related stuff, maybe Jerboa can add a similar feature.
As far as images without anything to note its a spider in the title, you’d need to add image recognition, which is something more likely to be added to Lemmys backend than as a clientside thing.