Google is an advertising company. Its goal is to create growth and maximize profits. How do you get more money if the free users leave? Raise the subscription prices.
If in the current arrangement the free users represent a majority of the costs, hassle and noise and a shrinking or stagnant share of revenue, then you get more money by turning the screws and seeing how many convert.
If in the current arrangement the free users represent a majority of the costs, hassle and noise and a shrinking or stagnant share of revenue, then you get more money by turning the screws and seeing how many convert.