I understand why you are using the words "rent seeking", but that's a defined term with a meaning which differs from what you're trying to describe: https://en.wikipedia.org/wiki/Rent-seeking
>"Rent-seeking is the act of growing one's existing wealth by manipulating the social or political environment without creating new wealth.[1] Rent-seeking activities have negative effects on the rest of society. They result in reduced economic efficiency through misallocation of resources, reduced wealth creation, lost government revenue, heightened income inequality,[2][3] risk of growing political bribery, and potential national decline. "
But Google actually is rent seeking by the economic description. The poster is just accusing google of a 'lesser charge' by misunderstanding the concept, they should fix their accusation of what Google is doing not change the term.
Charging for access to your products, or taking a cut for sales which take place in your 'virtual store' does not involve any social or political manipulation.
>"Rent-seeking is the act of growing one's existing wealth by manipulating the social or political environment without creating new wealth.[1] Rent-seeking activities have negative effects on the rest of society. They result in reduced economic efficiency through misallocation of resources, reduced wealth creation, lost government revenue, heightened income inequality,[2][3] risk of growing political bribery, and potential national decline. "