Signal is threatening to leave jurisdictions where they become illegal rather than comply. They're not threatening to keep operating in violation of the law.
Will you support the UK if they ask for the extradition of Signal developers, on the basis that say Signal will continue to have UK users accessing their service?
Where are your values?
You can - by not being inside the US, doing proper KYC and rejecting US customers.
Looking forward to doing KYC on my Signal account then.