Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: Tesla boss Elon Musk has grilled trading app Robinhood's co-founder, Vladimir Tenev, about why it limited users to only being able to buy a small number of shares in some companies.

Elon Musk grills Robinhood boss over GameStop row on Clubhouse