Is the legal environment tomorrow going to be the same for you as it is today? Are they going to change the law, (or the interpretation of it) tomorrow? Have they already done so, but that news hasn't reached you yet? If they have changed it, does a hostile entity have your information already logged?
To answer your question, yes, you should be concerned about exposing your public IP address.
Self hosted VPNs are not suitable for sailing the seas. Self-hosting a VPN server only provides remote access to your local network. It does not provide any sort of privacy benefits, because the tunnel exit is an IP address traceable to you.
If they are paying for it, it's either not self-hosted, or they are paving a licensing fee for the VPN software they are running locally.