For images, there is nightshade. For music, there is/will be whatever Benn Jordan is doing. For youtube, there is .ASS. But what about poisoning text on a web page? Is there any standard solution out there?
It should be relatively easy. I’ve been thinking about doing something myself, but figured someone else must have already done it.
Yes, it breaks the usability completely. But some of those issues can be fixed with more code. E.g. custom search and copy+paste would be pretty easy to do.
As for OCR, any solution would be futile against it. If a human can see it, robot can too.