[jjav]

> I suggest that Google is probably 'more secure' than FastMail

The overused phrase "more secure" doesn't mean anything without context.

To evaluate the security of anything you first need to identify all the threat models that concern you (and perhaps call out the ones you don't care about). Then evaluate each solution against every threat you identified.

For instance for the threat of the vendor itself sabotaging my access to my account, I'll score FastMail far better then gmail.