This is an official discussion thread linked from the www.privacytools.io website. This thread can be used for troubleshooting, questions, discussions and if you look for alternatives.
Some comparsion between Signal and Wire may be happening in the Wire thread.
So, Wire will hold some of my personal information in plaintext or encrypted, right? If so, what are these info? In comparison, Signal just gets my mobile number. Can I circumvent this by registeing with a virtual number paid by crypto?
Wire stores metadata such as list of your connections/conversations in plaintext (= not encrypted).
is what PTIO says on https://www.privacytools.io/software/im/ and the more information link goes to:
You can find their terms from https://wire.com/en/legal/#terms.
Yes. I guess with your own responsibility and you would possibly have to explain your contacts why you have a different number at Signal than everywhere else.
There is also a thread on anonymous Signal IDs that could be given to contacts instead of phone numbers in Signal Community Discourse.