The truth is that sidebar links in PBNs are no longer effective and pose more of a risk than a benefit, google has become very good at detecting these tactics, and today those links either offer no value or can cause problems in the long run.
The main problem is that google evaluates the context of the link above all else, a sidebar link is considered to have no editorial value and is ignored 99% of the time, furthermore, PBNs are easy to spot because they leave many traces, the same IPs, the same topics, link patterns, and low quality content, when a PBN goes down, all its links die, and the time and money you invested are wasted.
What really works now are editorial links in quality content, a single mention of your site in a relevant article from a reputable publication will give you far more value than dozens of PBN sidebar links, moreover, these editorial links also help you appear in AI generated summaries, something no PBN link can achieve, it's better to invest your time in creating content that people actually want to quote.