https://probelab.io/blog/peering-into-privacy-a-deep-dive…
Research report on Monero's network topology
You can see the Monero Research Lab's discussion with one of the ProbeLab researchers here:
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https://libera.monerologs.net/monero-research-lab/2026031…
Looks like all the spynodes ProbeLab identified are coming from a single entity Spruce Creek Networks LLC