Yes, you should and the choice exists, like the root comment mentioned. There are other services which allow you to communicate with people without having to associate your phone number with the service.
While you enjoy your "spam free" service, some of us will have to work with the separate but not equal alternative. In case you haven't noticed, as the common communication environment has become more and more locked-down (starting with mobile, and now spilling over into desktop), fewer people are using open alternatives. Simply observing that open protocols exist doesn't make them an actual de facto alternative.
Are you paying for it?
I can be reached by telephone. What I don't have is a unique telephone number. This works perfectly fine for actual voice communication. If you think I can simply afford an extra monthly expense, you're wrong.
> You are like 0.0000001% of the market.
Made up statistics reveal your presuppositions.
There are a lot of people that don't have a unique phone number. It's a minority position, but that's kind of my point: chat services do not inherently depend on traditional phone numbers, and requiring one is going to exclude more people than you probably realize.
And of course that statistic is made up. It was a joke.
Are you in a country which doesn't have pay-and-go service?