WhatsApp is avoidable with this same law forcing interoperability with other messaging clients. Facebook's app is avoidable with a browser and Facebook.com . Actually WhatsApp's app is avoidable in the same way.
They’re all avoidable by just not using them. Use that fancy text message feature of your phone to communicate. 30 years ago these apps didn’t exist and people somehow continued to exist without them.
Because everybody needs their conversations encrypted. What was that liberal saying, what are you hiding? Most people are not targeted by some state actor
Not selling anything here considering every reasonable solution to this problem is something offered for free, or can be mitigated by a user with FOSS.