Odd, I've worked for a DSP for years too. These data points you talk about are rarely all there. 99% of the OpenRTB spec is optional fields. I also never seen a bid request that listed other apps on the phone - calling bullshit on this one.

LMT does not hide your IDFA. You can reset it fine, but it's always there.

Also, hell hath no fury like a brand-safety conscious advertiser whose ad appears next to dick pics on Grindr.