I guess integration with Google Drive is a big convenience for users.
But yes, if the cost of getting access is to high for indie developers, then it make sense to avoid Google Drive. Creating and maintaining your own cloud sync service for a specific app may not be worth it, they should investigate integration with existing Google Drive competitors/alternatives.
This is more likely than you think. There’s more computers than you realise on the average network. Many aren’t updated and have vulnerabilities. If there’s one malware on one machine on your network, that means a malicious actor is on your network.
Common exemples :