The last driver to become world champion using a Honda engine was Ayrton Senna in the 1991 F1 season... The success of leading Max Verstappen to become the 2021 F1 world champion is also a perfect cover for Honda...(After 30 years without a Champion)
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Since some time ago Honda has stated that it will leave F1 racing after the 2021 season ends... Honda decided to leave F1 in 2020 ago.. In a statement, Honda said the decision to leave F1 was because the automotive industry underwent a period of enormous transformation in a hundred years ...
It has been known since the start of the season that Red Bull will not be using Honda engine perse, but their own engine. They purchased the factory the formula 1 engines were manufactured for Honda, which in return means Red Bull basically has their own engine factory nowadays, it is still Honda obviously and they hired their staff and all, it is just that the costs will be paid by Red Bull and not Honda, so Honda will not be paying for that factory anymore but will not be getting the profits from it neither, whereas Red Bull will have to pay for it but they will not be paying Honda anymore. It is still sort of the same thing, doesn't really change much if you ask me.