>So we can make registration or adding contacts paid (in cryptocurrency) and the problem is gone.
The majority of the user base would be gone, too.
I had a hard enough time convincing my friend group to use Signal as is. If they had to pay (especially if it had to be via cryptocurrency) none of them would have ever even considered it.
I would rather pay $1 than with my phone number which is much much much more valuable. Telegram did an experiment with paid anonymous registration, but the prices were ridiculous and targeted for the riches.
>I would rather pay $1 than with my phone number which is much much much more valuable.
Most people would not, though, and that's the issue.
So let everyone pay with their preferred method and let evil governments go mind their own business.