You're account is at risk of getting ban if there's another user connected to the same WIFI and are accessing the same website you access. It could be flagged as multi accounting. So I suggest that you don't do it again if your account now is still fine, prevention is always better than cure as they say.
Additionally, there's also a chance that your account will be hacked, and according to this article (https://www.aura.com/learn/dangers-of-public-wi-fi), here are the 10 Dangers of Public Wi-Fi .
2-Infecting your device with malware
3-Stealing your passwords
4-Snooping for confidential data
5-Business Email Compromise
6-Ransomware attacks
7-Session hijacking
8-Taking over your online accounts
9-Targeting you with phishing attacks
10-Gaining remote control of your device