Cease and desist letters from predatory law firms are a very real thing, even in Europe. In Germany, entire law firms have been established for the sole purpose of collecting out-of-court settlement fees for small mistakes in websites' legal notices, which they find using automated searches: http://transblawg.eu/2003/10/13/u-s-comment-on-impressumgerm...

GDPR will give them new ammunition on a European scale.