Google has a massive advantage because A) The barrier to entry is low because most of the services are free and B) Just because somebody owns an Apple device do

Google has a massive advantage because A) The barrier to entry is low because most of the services are free and B) Just because somebody owns an Apple device doesn't mean they can't use Google. There's some overlap but the companies just don't do the same things. Unless they decide to lock themselves in a segment of the market that overlaps completely, there's no reason they can't both be successful.