The dispute between different courts over whether data breaches can be warned by competitors is somewhat similar to whether and what influencers need to identify. In both cases we have new legal issues, courts that have decided differently and felt for each resolved problem two new ones.
Be that as it may, the Regional Court of Stuttgart has now also ruled that GDPR infringements cannot be warned. It thus agrees with the Magdeburg Regional Court(see this post), but contradicts the Berlin Regional Court(more on this here). You can also read about a few other decisions in this post.
Unfortunately, there is no legal certainty at the moment, because even lawyers are probably divided on this.
If you go the safe way and get a pre-prepared privacy policy, which should be sufficient in many cases, you should, however, observe the license determination of the providers and in no case copy the declaration from other pages. Just because some providers offer the privacy statements free of charge or very cheap does not mean that they are royalty-free. Often, for example, the name of the provider, including linking, must appear or similar rules must be adhered to. Failure to do so threatens warnings, some of which have been on the move recently.