Wrong again. Please research before you start shouting.

WhatsApp uses the Signal protocol. The difference is, it being owned by Meta, it also logs all the metadata it can alongside your real phone number.

Signal messenger uses the Signal protocol. Contrary to WhatsApp, it does not store any metadata. Your phone number is used by the Signal protocol merely as a cryptographic hash. That means, it’s impossible to know who is communicating with whom.

It is not replacing “one system” with “another system”. It essence, signal is WhatsApp, but with all the added spying features stripped, none added.

You know that your phone number is never saved anywhere? Signal only uses a cryptographic hash of your phone number.