And since governments make the laws they can decide if they ban gambling completely, if they allow some gambling games while banning another forms of gambling or if they allow almost all forms of gambling, it is up to them and while I would prefer that most governments were progressive on that topic at the end of the day we need to follow whatever regulations we have in our country, fortunately for me I live in a country in which gambling is allowed so I do not have to hide my preferences at all, as it happens to some other members that live in other countries.
the OP needs to revisit his post and maybe differentiate gambling vs sports. because he only provided the definition of gambling but he forgot to post the definition of sports. so maybe, he will understand that sports itself is a stand-alone industry
so yes, sports can exist even without gambling. and since every country has their own stance towards gambling activities, they can impose whatever they deem necessary - according to their religion, culture etc.
it is not the case that if the sports is legal then gambling on the sports will be legal as well.