There are no different rights for films and television, that's what you don't understand. If Disney films a Hulk project then it's up to Universal to decide whether it will be released as a theatrical film, a TV series, or sell it to a streaming service. Disney might want to release it theatrically but if Universal disagrees then there is nothing they can do about it. This isn't a Spiderman case where Sony has the rights for theatrical films but Marvel has the rights for TV projects.
Ask yourself this: Feige announced a She-Hulk series back in 2019. These three years, from announcement to release, has there been any news about any kind of involvement by Universal?
No. Because they have no rights, distribution or otherwise, on the character. This is Marvel's rodeo and they can do whatever they want.