@RadbeetSure, go swimming with that open wound. What's worst that could happen?
This: https://www.livescience.com/59353-tattoo-flesh-eating-bacteria.html
Do you realize the person that you're replying to posted that in 2014? They also haven't visited the forum since then.
Every aftercare I've ever read or heard says not to swim for a certain length of time after being tattooed. If you can't follow the instructions given why bother getting it?