Yes, someone who provides more hosting power can earn more. Yes, someone could set up hosting in a data center. But no, that would not threaten the distribution of Holo's ecosystem. Every holochain user still holds their own data, and every Holo host who carries an app is still in the rotation for DNS resolution to valid hosts. Just because you set up a data center doesn't mean all the traffic suddenly comes to you on a Holo hosted app.