If you look at what gets copied to the clipboard, GTUBE is at the end of it.
I just sent an email from my gmail to my Gsuite backed mailbox with the gtube text, didn't work :(
the email landed in my inbox.
My selfhosted mailcow (https://mailcow.email) instance blocked me from sending it (the SMTP server actually rejected it), and then blocked the one I sent from Gmail to it with 554 5.7.1 Gtube pattern. Didn't even show up in Spam.
Why not both?
Because EICAR might get the email straight blocked instead of marked as spam.