> data gathering
It's not really any worse an invasion of privacy than Snowden or Wikileaks. At least Google apologizes instead of going on about how information should be free.
> more dependent
Google actively reduces dependence, e.g. by their data takeout option. Obviously there's always going to be some switching cost but it's not like Google is a prison.
> Who do you call if gmail craps out
Well, if you have a SLA, you just call them on their 99.9% uptime guarantee: https://www.cnet.com/news/can-you-trust-your-business-to-goo...
I guess if you're a consumer you don't get the same level of support, but it uses the same infrastructure so any problems will show up on the dashboard: https://www.google.com/appsstatus
The reparations in all cases are limited to service credits, so you'd just be getting more free use of an already free service.