If a third party or government wanted to infiltrate the email or other service provider of a business they were interested in, then it doesn't matter if they're

If a third party or government wanted to infiltrate the email or other service provider of a business they were interested in, then it doesn't matter if they're Google or another provider. They'd go after whoever has the data. I would actually trust Google to have more technical expertise to withstand an outright attack than a smaller ISP, and to play hardball with lawyers more if compelled otherwise. And if worst comes to worse and they are forced, I'd trust them to make a stink about it like they did last year with searched in China.