Insert sponsored content into the server

Hello everyone, I wanted to ask a question regarding the possibility of inserting sponsored advertising content, in the form of banners or billboards around the map.

I saw for example, an Italian FiveM server called “Vanquest” and another called “Impero”, they are sponsored by many companies

I wanted to understand, legally, is it possible to do this or it would go against FiveM policy. If it goes against policy, is there a legitimate way to do it?

Thanks in advance for reply

Albert