The new owners are so trustworthy that they weren't even transparent about who they are. In the comments of the original announcement they defend that with:
This post wasn’t about Chosen — it was about Robin and the legacy he built over 24 years. We’re the new owners and ultimate decision-makers at Nexus Mods. We’ll share more about ourselves when we’ve earned that right. For now, we’re focused on listening, learning, and making modding even easier, and yes, you’ll see us around in the community being active.
I can't say I find that statement to be particularly trustworthy given it's coming from an NFT bro.
They've been flagging physical carts showing up in multiple places at the same time since the very moment the first Switch flashcart appeared (so likely before we ever had our hands on any). Places discussing the flashcart had been talking about increased detection and bans for a year or so.
It was even done on the 3DS before that. The 3DS had a whole tiny niche ecosystem of people selling "private headers", dumping only the unique per cartridge info and selling it with the promise that they'd only sell any given header to one person. That too had a few instances of normal people complaining about bans with pre-owned games.