Mercedes team boss, Toto Wolff, has questioned Formula One's desire to attract new engine builders to the sport when it already has four committed manufacturers involved.
At the end of 2017, F1 outlined a vision for 2021 in which it planned to address critcism levelled at the current set of engine regulations. As well as improving the noise of the existing power units, F1 aimed to level the playing field among existing competitors and attract new manufacturers to the sport.
However, plans to simplify the current engine regulations to achieve those goals were met with opposition among existing manufacturers, who complained the rule changes would simultaneously dumb down technology and incur additional development costs.