If you're concerned about privacy, don't use a free service. Pay for it and the privacy concern usually goes away.
If you specifically concerned with US laws go German:
https://posteo.de/ is a good one to consider.
On the other hand, I can see trusting a paid provider more for reasons of stability, level of support (in case, say, I lose access to my account), and continued development (the Gmail webclient has been relatively stagnant for a while now).
I keep backups, but in ~13 years (I've been on Gmail since nearly day one) I've never had any issues.
For everything else, use Signal.
If this is tamper and intrusion proof, this is other story.
More worrying is the dark fiber backbone between Frankfurt and Darmstadt and the satellite uplink from both space agencies placed on the same city. Plus the fact they keep hiring more contractors to work on that specific location. If critical networks are monitored, civilian networks stand less of a chance.