Watch the PING CTF 2023 official trailer and find the flag!
Nothing on the video seemed to indicate a flag, and rememeber — this is a web challenge.
I decided to run curl https://www.youtube.com/watch?v=siZPvEGrtNY | grep "ping{" to see if there was anything in the source code, and quickly found the flag:
ping{hello_welcome_to_ping_ctf}