"We chat" is just to combination of multiple apps. There are many apps with similar concepts like messenger apps. You hardly find any uniqueness in Skype, WhatsApp, Viber and signal etc. but all are successful and have billions of users. They all trying to solve same problem with similar solutions. The only difference you find is UI design and some minor things. Similarly, Udemy, LinkedIn learning, Lynda and Edx offers almost same services. Do we need to find problem or can we solve same problem which is being resolved by competitors?
There is a difference between mixing up with the rest and been a trailblazer. If you want to just make money by owning a company, then you can join in the fray and just do what others have done before. However, it is different if you want your name stamped on the sands of time. Every great company has always looked for a problem in society to solve, s yearning, a void to fill.
Doing this will make you as a company unique, and no matter how the years role by, people will continue to see you as the real deal. Facebook was the first of its kind, while others like LinkedIn and We Chat have also come up, you will agree that Facebook has continued to hold on to top spot.