Default setting mobile data usage (why off?)

I set up a Pixel 7a with Android 15 yesterday and obviously also installed 1Password. I just noticed that using mobile data in the background is disabled by default.
I am curious now: is that how it should be? If so, is there a reason for this?

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1Password Version: 8.10.52
Extension Version: Not Provided
OS Version: Android 15
Browser: Not Provided