> Problem is there are thousands of channels open by Phoenix, which can't route

They can

> they will probably not live swap their non routing wallet to your blinder

There's no way to tell if they do or don't. The fact that it's possible for them to route undetectably means any of them might be doing it. Acinq has no way to know.

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The assumption they can't is correct in 99.99% cases. More than 30% is already a privacy problem.

It's called heuristics.