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: https://askubuntu.com/a/95911/640314

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

But the address https://checkip.dyndns.org 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.