Has anyone tried Saily? (https://saily.com/) It claims to be an app to easily setup international eSIMs.
I am curious about its setup process and the information they collect. Can you sign up without the app? How about the app on a separate user profile (android)? Do they require ID to signup (or similar)?
It is a part of NordVPN, which gives some confidence that it is not a scam, however Nord doesn’t have a good reputation for privacy, but neither do SIM’s in general.
Is it worth bothering with anything like Saily for travel, or does the tried and true pre-paid SIM’s?
From: https://support.saily.com/hc/en-us/articles/15751399206172-How-do-I-install-the-Saily-eSIM-on-my-device#Android-Manual
It seems you could install it on different device then. There’s also “share eSIM to other person”, which likely too just shows a QR code.
I don’t know about Saily, but I doubt they would want ID. At least for data-only SIMs, if they do offer ones with phone number.
I did a similar thing with a different eSIM provider when I was concerned about privacy, though eventually I did put it on my phone.

I don’t know what else to use on Linux to get disposable Android containers.
Anyway, while it is not related to privacy, they also seem quite expensive. At least for Europe. I don’t know where you’re going. I’ve used BNESIM, which funnily is cheaper than local SIMs for small data amounts (like 1 or 3GB), especially with SIMs without expiration. That can be used without app for sure, but I’ve had to use non-blocking DNS.
Anyway, whatever you choose, use virtual payment cards. Something like privacy.com. There’s a ton of eSIM providers and I am sure they’re not all super safe and legit. My bank provides those thankfully.