DNS/hijacking/事例/periscope.tvについて、ここに記述してください。
https://hackerone.com/reports/531890
Subdomain takeover on dev-admin.periscope.tv
State Resolved (Closed) Disclosed May 29, 2019 3:00am +0900 Reported To Twitter Asset *.periscope.tv (Domain) Weakness Privilege Escalation
Subdomain takeover on dev-admin.periscope.tv Subdomain takeover on dev-admin.periscope.tv/index.html
http://dev-admin.periscope.tv.s3-website-us-west-2.amazonaws.com/index.html