They have still been tweeting about valorant- I doubt they will be leaving for good. They are probably just waiting for next year as the scene will probably be changing quite a lot soon as the TO changes
Tier 2 orgs dropped their roster and pick up players again before season starts to save money cause esports really isn't financially sustainable unless you constantly win
its really because living expenses are getting higher so orgs have to pay more than any other region, and franchise is terrible and now that NA doesnt even have guaranteed ascension cause BR is actually good again theres so little point to invest