Back in 2017/2018 we didn't have half of the events f2p are getting now so idk what are you talking about mate. It's endless story of people begging first for Myoboku Trials -> Fuku deals (now apparently meh for them, why save coupons when fireworks for free right...) -> Fireworks.

I mean just look at every event post, I really don't like how oasis does a lot of things (cough 3k$ paywalls for ninjas cough) but right now in 2020 f2p events are actually solid so just chill and wait for a rotation that can obviously change at any point like fuku deals in a row last week probably started new schedule.