The spirit of this market is to see if by 2050, all Formula 1 contenders have removed Internal Combustion Engines (ICE) from their car.

It would not require a rule, but it would require that all contenders are free from ICE.

Battery Electric -> Resolves positive
Hydrogen Fuelcell -> Resolves positive
Hydrogen engine -> Resolves negative
Biofuel/Efuel into an engine -> Resolves negative

Creating this market as a response to the president of Formula 1 (motor sports group) stating Formula 1 will "never go electric": https://www.businesstimes.com.sg/lifestyle/formula-1-will-never-go-electric-ecclestones-successor