1.It's Culture bro except for KRJP In most of APAC There is no support or encouragement for playing Video Games. There's only discouragement. There is only encouragement for STEM, You either become Doctor, Engineer or Lawyer never a Gamer. If you tell someone that you are a professional esports athlete , they'll ask but what do you do for living. It's not considered as Profession here.
2.Both EU and NA have had a strong FPS Experience prior to Valorant.
- All the billions of people you mentioned don't have PC's in their house. most people have smart phones because of which mobile games like pubg have gained and are gaining more popularity.
4.Read This article "Benkai Shares How Shiba's Parents Learned About his Valorant Career Just Before Masters Berlin" on ex paper rex player shiba and how whole team convinced his parents to let him play in masters Berlin.