The metadata would not helped much because the pic is made from screenshot not digital camera.
well, who knows what screenshot tool puts in there? unix user info? could contain email-address, hostname, whatever.
"registration info" like MS Word does. But as long as the information is kept "generic" this will not help much. Some pedos were busted because they left metadata with GPS coordinates on homemade preteen pussy pictures and back in 90-ties some madman was caught because he sent floppy to police with word document that was registered to some church.
The metadata in electrum screenshot was a minor overlook but most likely it would not let us reveal who you are even if there was metadata.