All browser render webpage differently, so if you have to test your webapp or website then you have to setup your own infrastructure as there are more than 2000 + browsers. So setting up own infrastructure would be more time consuming and costly.
LambdaTest is cross browser testing platform where you can test you web applications across 2000+ different browser and operating system combinations. Each environment is running on real machines with real operating systems and real browsers.
We are building this product basically for those who works around web and web app development. As they have to test the rendering of their webapp or websites across different different browsers and OS and that's where LambdaTest helps them to test.