Having your work plagiarised is extremely stressful…
How big is the problem?
Widespread. Off the scale. And the more popular you are, the worse it is. Anything that can be reproduced gets pinched.
Have you been a victim?
There are companies around the world selling my art on clothing. I did art for a how-to book years ago, and one of the things that gets pinched a lot is some pictures I drew to teach how to draw cartoon-style eyes. So, if you go to Amazon, Etsy or eBay, there are dozens of sellers marketing these cartoon eyes all over clothing. Someone traced them as a vector drawing and now they’re everywhere.
Is enough being done?
Absolutely not. I’m not really sure of the differences between the laws in the US and other parts of the world are, but then, that’s part of the problem. If you’re in one country it’s virtually impossible to enforce your rights in another.
What can artists do?
You’re never going to be able to convince some sociopathic goober on the internet that ripping artists off is a bad thing. Concentrate on reasonable people. Explain. Communicate. They will understand eventually.
What about the future?
Things will get worse before they get better. Our governments don’t push hard enough to get corporations to do the right thing by other people’s rights.