If I were to set up a system and deployed a tunnel to it, is there anything I'd need to do to ensure it cannot communicate with other tunnels/networks (excluding its normal access without cloudflared), or is that not even a thing yet?
Could be several things. Did you recently purchase/renew the domain (within the last 60 days)? Could be transfer locked, not sure if that would make it state that.
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cdn-js is actual software as I understand it (to pull down, sync, and serve things), whereas your project isn't really open source software. Worth a shot though