This one is missing on the list:

https://www.ssllabs.com/ssltest/analyze.html?d=web.whatsapp....

Are they serious???

  - Vulnerable to POODLE
  - too short HSTS value
  - RC4
  - SSL3

"maybe they need to support ancient broken browsers"

EDIT: As only Chrome is supported, RC4 & SSL3 are moot.