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Re:Police raids across Europe after encrypted phone network ... by sva_ on Friday March 12, 2021 @07:18AM (#26434969)
Signal has a function to delete messages after a set interval (after having read it.)

I don't know about Sky ECC, but Signal requires a Phone # to register, as far as I remember. It's increasingly hard to get anonymous Phone # in the EU. That might be an argument against using it.

Re:Police raids across Europe after encrypted phone network ... by jfhrnrkfkf on Friday March 12, 2021 @08:43AM (#26435720)
Open the Desktop Signal app, connect it to your phone, and watch it download all the supposedly "expired" messages.

They will not always be shown, but they are downloaded.