Samsung Internet and Iceraven (probably Firefox, Mull, etc. as well) both disable screenshots in their private modes by default. Thankfully, you can disable this functionality in their settings.
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There's an option in Developer options that'll allow to bypass that setting
Edit: this is on lineage OS but I can't find it in version 21 maybe it's on 20
What option is that? And which Android version?
I get banking and financial apps doing it. But shopping apps yea, wish we had a permissions override
I've seen public transportation apps doing that to curb sharing the ticket/barcode with someone else.
I understand that for security compliance reasons. But beyond that, yupp. It sucks.