Is this the norm for unpaid internships?

so i am currently in my 6th sem and i recently got an offer for an unpaid, remote Cloud Engineer internship. Initially, we agreed on a 3-month duration hence i did the interview, but when I got the official offer, it said 6 months instead. When I asked HR about it, they said it's the same for everyone and that I’d have to complete the full term.

What surprised me more was the number of financial and personal documents they asked for during onboarding—bank details, multiple IDs, residence proof, and even financial account proof. For an unpaid internship, this feels excessive.

Is this common practice, or is it a red flag?
i know unpaid internships itself seems reflag but as a tier 3 grad i feel something better than nothing