They don't need to force users to do that and an application is one more choice for their users to choose what to use for betting with the platform.

In reality it's easily to say that nowadays, people spend a lot of time daily on mobile devices and they tend to use mobile even more than with desktop computers or laptops and some people even don't use desktop, laptop but only or mainly use mobile phones.

So with these people, they likely tend to download available applications for trading and betting.