I know that at least the Google Pixel devices only charge when plugged in. The user has to manually turn on USB data every time they plug in. USB debugging is also disabled by default.
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You're right. My Android smartphone as well asks for my interactions in order to allow data transfer, but who knows. I wouldn't take the risk.
What I'd recommend, is to have a "USB condom" (charge-only), in order to ensure physically (besides logically, like you mentioned), that there will be no chance of juicing my data.
Doesn't cutting the data lines prevent fast charging?
USB-C and the fast charging (well, power delivery negotiations) make USB condoms... tricky.