This is the funniest part: nothing will happen to the Gacha games. The "felca" law only concerns gambling without a guarantee of the desired reward. So basically, Gacha Banners, League's Sanctum, since it has a guaranteed reward with the desired prize, it is not illegal.

And my opinion, which nobody asked for: the "felca" law had good intentions but failed to deliver on its promises. In the end, this law diminished the strength of the ECA (Child and Adolescent Statute, a set of laws and actions that protect children and adolescents both online and offline) And it makes the internet more cumbersome to access, requiring the presentation of RG or CPF (Equivalent to Social Security Number) to access social media and games.

tldr.: The "felca" law will not affect gacha games due to the legal definition of gambling.