This spinner spins at the end of each round and is free for everyone, and gives them a random reward (the player cannot buy spins) and it only happens at the end of each round.
the player can buy in game currency
Is this considered a lootbox and do I have to disable this in banned countries?
Would I need to disclose chances?
Considering you’re not wagering in-game currency OR Robux, I would say it’s not considered gambling. I am not 100% certain though but I think it’s likely okay.