Earlier this year, I made the switch away from GMail to FastMail, a pay service for email. My objection at the time was regarging control of my data and I noticed how GMail had never let me down in the past.
Well, that's changed. Google is cutting off access to their Exchange servers for non-paid email accounts. Exchange is the only way to receive push notifications on iOS from GMail using the built-in Mail.app. iOS users who want to receive push notifications from GMail will be relegated to using the GMail app.
Not only is their communication about this change pretty vague, but they're giving everyone a whopping 6 weeks notice.
This makes me nervous.
If you're interested in switching to a paid email provider, I can't recommend FastMail enough.