I almost want to set up a competitor to this (having not read the patent) and sell it for $5 per code. Could one simply ignore such a silly lawsuit? Or would it

I almost want to set up a competitor to this (having not read the patent) and sell it for $5 per code. Could one simply ignore such a silly lawsuit? Or would it really ruin me if they sued? Honestly, a bit.ly clone like this would take an afternoon to do well.