Larger than the 10 MB attachment limit of most email providers.
I'm unaware that Signal is geographically limited in any way.
Signal is anonymous as your phone number is. PGP isn't anonymous either, so this seems like an irrelevant criticism.
Again, you can obfuscate the recipient as much as you can obfuscate a phone number. You can't obfuscate the email address you're sending your encrypted email to.
This depends on how they use contacts to match users. I believe they only collect a hash of the phone numbers you choose to share with them.
I'm unaware that Signal is geographically limited in any way.
Signal is anonymous as your phone number is. PGP isn't anonymous either, so this seems like an irrelevant criticism.
Again, you can obfuscate the recipient as much as you can obfuscate a phone number. You can't obfuscate the email address you're sending your encrypted email to.
This depends on how they use contacts to match users. I believe they only collect a hash of the phone numbers you choose to share with them.