I think the most interesting part of this article is that this "collusion" is enabled via 3rd party data provider. This is a massive issue, that enables this sort of "uncoordinated" price fixing exercises, via 3rd parties, similar to what happening on the rental market in the U.S.

I'm very surprised that there is not more work in Econ literature studying this. This is essentially breaking the efficient market hypothesis at scale, and is generalizable to every industry.