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Compromised describes exactly what you are talking about. Any free rider on a network that the operator is unaware of means the device is compromised.
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If I'm using one of these services while connected to a guest wifi network, with the usual configuration for guest access (like no intranet connections), is that guest wifi network compromised? What's the threat model?
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If that guest WiFi network is running inside the White House? Yes, I'd say that is compromised. The threat model being that guests on that network may be diplomatic officials and staff.
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> is that guest wifi network compromised?

I'd say yes since you've allowed random people unauthorized use of the connection. It makes no difference if it's your connection or not. For example, if that proxy gets used as part of a DDoS attack, your device compromised that network.

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how is this different than Tor? You seem a bit on the surveillance side. The computer/network is compromised if someone gains unauthorized access to it not if you share it.
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TOR doesn't use unsuspecting participants as exit nodes, that's something you have to specificially enable.
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What part of that isn’t technically “compromised”? You can argue there’s no evidence of it currently being weaponized but I’d say some shitbird running a free vpn inside the White House is not a good look regardless.
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We'd need a pedantic definition of "compromised" to be sure
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