(Reuters) - Alphabet Inc's Google will cut the service fee that it charges developers on its app store by half for the first $1 million in revenue they earn every year, it said on Tuesday, after a similar move by rival Apple Inc last year. Both the companies have come under fire from large firms such as Microsoft Corp, Spotify Technology SA, as well as startups and smaller companies, that allege the fees deprive consumers of choices and push up the price of apps.