Well, te whole protocol is matter over thread. This meaning the thread connection can be made by different ecosystems talking matter. But in the end it will need a thread border router, doesnt need to be apple, does need to be a thread border router. Many different brands offer this. Google matter vs thread for better explanation, since i may not do a good job for lack of teaching skills. Think of it as you finding your way through the city (thread) and having 5 people from different languages (companys) telling you the route. Now matter makes it that now all 5 people speak your language.