It has been for a long time. PageRank was never designed for adversarial scenarios. It reminds me of KPIs like lines of code - it's only useful if it cannot be manipulated. "When a measure becomes a target, it ceases to be a good measure." https://en.wikipedia.org/wiki/Goodhart%27s_law
The real consequence PageRank had was that it got web pages to stop linking to each other…. Google gaslighted people into removing the competition they could have had navigating from one page to another through links. (e.g. web directories)