Google has been doing this for a while with YouTube
The data collection and surveillance will of course be used to support online advertising services. The ads can be delivered outside YouTube by other Alphabet business units or partners
There seems to be a myth that paying so-called "tech" companies solves the problem of data collection, surveillance and online advertising. As if for every subscriber the company will voluntarily collect less data, perform less surveillance and sell less ad services, leaving that money on the table
The truth is that these subscribers, by paying the companies that perform data collection, surveillance and advertising services, are actually subsidising the practice