There's no need for a nation-wide ring with bikes. With cats, it is because you need connections to a refinery that will accept your stolen cats... but bikes can be fenced locally in a bike store.
Is there a national bicycle theft ring? I have a vague impression that it's mostly small groups. Steal a few bikes, maybe swap some parts around, sell them as used bikes, repeat.
This takedown seems to have been possible because there was a central group that was moving hundreds of millions of dollars of stolen goods - maybe even billions if you take "cost to manufacture" instead of "resell value". Why would a bike theft ring that centralized exist?
I doubt there is one, it seems to me that even with bikes being as expensive as they are the value isn't there. But, maybe? There was an interesting story a year ago about bikes being stolen from CO and popping up for sale in Mexico. The article is long but has a summary at the top of the page.
https://bikeindex.org/news/closing-the-loop-a-deep-dive-on-a...