How many change detectors to mitigate against 51% attacks? Realistically, even with this extension functioning as advertised, there are still plenty of related

How many change detectors to mitigate against 51% attacks? Realistically, even with this extension functioning as advertised, there are still plenty of related risks. E.g., a software company could disguise its motives early on and convert its product into malware at a later date, or the developer could be paid by a 3rd party to add certain features.