The "colleagues" lawyer Kilian Lenard (www.ra-lenard.de) and Nikolaos Kairis (www.raag-kanzlei.de) recently drew attention to themselves with their mass warnings on the subject of Google Fonts. Attorney Lenard represents Mr. Martin Ismail and Attorney Kairi's wife Wang Yu.
The warnings state that using Google Fonts without prior consent constitutes a data protection violation. The lawyers and their clients would then like to see money in the form of damages for this information.
We recommend our clients not to comply with this claim for damages. Both warnings are based on § 823 paragraph 1 BGB.
Whether the (non-local) integration of Google Fonts actually constitutes an infringement that can be admonished remains to be seen. Because the warning itself is already illegal.
It is highly doubtful whether the warning persons were really personally on the respective homepages or whether (which is more likely) it is an automated process by a bot. In any case, the latter is not entitled to any claims for damages.
Even if the claim for damages should exist, the probability that the warning party will sue you is extremely low. Because they will have to put up with a reduction of the claim according to § 254 BGB (obligation to mitigate damages) - which makes the judicial enforcement very risky for the opponent due to the cost risk.
At the end...
In short: we recommend you not to respond to the warnings! Do not write to the other party and do not pay the unjustified claims.