Phone messaging apps comparison

I made this chart for a presentation at the Berkman Klein Center

Whatsapp Telegram Signal
Source code closed source open source open source
Api none various library
Encription protocol state of the art self made state of the art
Contact list location cloud cloud cloud, encrypted
Forward Secrecy yes yes yes
Database phone storage cloud phone storage
Backup capability Icloud or Gcloud builtin none
Revenue ads (Facebook) donation based donation based
Federation no no no
Alternative download location website F-Droid none
Uses third party services no no Google Cloud Messaging
Servers location US Russia US
Tied to mobile number yes yes, but nickname available yes
Desktop client no yes no