For example, you can refuse to use Google Chrome, and instead choose Firefox or Vivaldi. Your web experience will be slightly different, but the most important parts will remain the same: You type an address, you wait for it to load, and you access the content.
On the other hand, refusing things like WhatsApp means there's a non-insignificant amount of people that use WhatsApp to communicate exclusively. This may not have impacts for you, personally (although I would be hesitant to believe that), but it definitely leaves out billions of people who communicate exclusively via WhatsApp.
A similar thing happens, for example, if you refuse to use YouTube, which is the largest Internet video platform on the planet: You will have to refuse to watch any content that is only uploaded to YouTube, or put up with frontends that use YouTube in the background, or perhaps even be forced to pirate videos, neither of those three options is good for different reasons.