-snip-
I realize there's no way to know for sure, other than having your own server; but are there any that have at least a relatively good reputation for not snooping on users?
Reputation is relative, but if you're looking a famous service's server who claims that they do not keep logs;
Blockstream's server has it.
Here's what the console tab shows once you connect to their server.
"Welcome to electrum.blockstream.info - no logs and Tor support - Please learn about running your own server!"
But don't take this as a vouch since it's not possible to confirm that claim.