The ad system doesn't publish a readable sellers.json, so nobody can verify these lines. That's the ad system's gap, not the app's, so no points are deducted.
Evidence (25 of 39)
line 4 vungle.com,6abd6266fb6acbb421dbf2a9,DIRECT,c107d686becd2d77
→ sellers_json: HTTP 403
line 20 admixer.co.kr,1610,RESELLER
→ sellers_json: HTML or login page instead of JSON
line 30 appnexus.com,11470,RESELLER
→ sellers_json: HTTP 403
line 31 appnexus.com,11924,RESELLER,f5ab79cb980f11d1
→ sellers_json: HTTP 403
line 32 appnexus.com,12700,RESELLER,f5ab79cb980f11d1
→ sellers_json: HTTP 403
line 33 appnexus.com,13293,RESELLER
→ sellers_json: HTTP 403
line 34 appnexus.com,13297,RESELLER,f5ab79cb980f11d1
→ sellers_json: HTTP 403
line 35 appnexus.com,15349,RESELLER,f5ab79cb980f11d1
→ sellers_json: HTTP 403
line 36 appnexus.com,15426,RESELLER,f5ab79cb980f11d1
→ sellers_json: HTTP 403
line 37 appnexus.com,15816,RESELLER,f5ab79cb980f11d1
→ sellers_json: HTTP 403
line 38 appnexus.com,17417,RESELLER,f5ab79cb980f11d1
→ sellers_json: HTTP 403
line 39 appnexus.com,4052,RESELLER
→ sellers_json: HTTP 403
line 40 appnexus.com,7597,RESELLER,f5ab79cb980f11d1
→ sellers_json: HTTP 403
line 71 ced-ns.sascdn.com,4383,RESELLER
→ sellers_json: HTTP 404
line 72 ced-ns.sascdn.com,4811,RESELLER
→ sellers_json: HTTP 404
line 90 eskimi.com,2020001211,RESELLER
→ sellers_json: HTTP 403
line 91 freewheel.tv,534608-r-523319,RESELLER
→ sellers_json: HTTP 403
line 132 loopme.com,10999,RESELLER,6c8d5f95897a5a3b
→ sellers_json: HTTP 403
line 133 loopme.com,11362,RESELLER,6c8d5f95897a5a3b
→ sellers_json: HTTP 403
line 134 loopme.com,11414,RESELLER,6c8d5f95897a5a3b
→ sellers_json: HTTP 403
line 135 loopme.com,5679,RESELLER,6c8d5f95897a5a3b
→ sellers_json: HTTP 403
line 136 loopme.com,9718,RESELLER,6c8d5f95897a5a3b
→ sellers_json: HTTP 403
line 147 ogury.com,94097320-ac25-4bfb-9082-c6784e3932fd,RESELLER
→ sellers_json: HTTP 403
line 152 openx.com,537149888,RESELLER,6a698e2ec38604c6
→ sellers_json: HTTP 403
line 153 openx.com,540031703,RESELLER,6a698e2ec38604c6
→ sellers_json: HTTP 403