They're not "world champions", that title is reserved only for the biggest stage of the year, which happens to be called Champions for a reason. You can call regional winners champions since its in the context of a regional tournament, but Masters and Champions are both international events, so the "world champions" title is reserved to the C in VCT. SEN and their players were never world champions, FNC and their players were never world champions, they were Masters winners. 2023 EG and their players on the other hand are world champions, 2022 LOUD and their players are world champions, you get the point.
It disgusts me to see that title be given for events like Masters Madrid or even LOCK//IN which isn't even a Masters event. We should start taking shit seriously people, we keep throwing around that title like it has no meaning.