This has nothing to do with federation, reddit was a single system and had the exact same issue. It’s simply a result of having communities that overlap in topics, or articles that are relevant for multiple communities.

The key is that each of these posts has a different discussion due to the different community it is in, isn’t that good?

Yes, this isn’t your average “junior engineer introduces minor bug, exposes volnerability” type of problem, this is very clearly “we know very well this is terrible but we’re selling it using a bunch of buzzwords, so we couldn’t care less”…

Sadly there aren’t a lot of meaningful legal mechanisms to sue these types of scams