OK - If you decide to go off and include this library in a commercial project that is your choice and I probably would not find out.
If you use it in a commercial web site as a library - go ahead. I'm not going to be able to do anything about it.
If you join it to an open source project again under GPL - that is fantastic and continues to support the community that started this.
The GPL is not viral. You have a choice to make.