Can it be dangerous to curl without any option an HTTP address?

I wanted to know my external IP address from the command line. I found this answer on askubuntu:

curl -s | sed -e 's/.*Current IP Address: //' -e 's/<.*$//'  

But the address is detected as malicious on several forums.

Was my curl command was dangerous for my system in my case?
Also in a more general way: is a curl without option (and with a sed) dangerous? By dangerous, it can mean anything else than just printing my IP Address, executing malware etc.