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https://en.wikipedia.org/wiki/Strategic_lawsuit_against_public_participation
Strategic lawsuits against public participation (also known as SLAPP suits or intimidation lawsuits), or strategic litigation against public participation, are lawsuits intended to censor, intimidate, and silence critics by burdening them with the cost of a legal defense until they abandon their criticism or opposition.
In a typical SLAPP, the plaintiff does not normally expect to win the lawsuit. The plaintiff's goals are accomplished if the defendant succumbs to fear, intimidation, mounting legal costs, or simple exhaustion and abandons the criticism. In some cases, particularly in the context of investigative journalism, repeated frivolous litigation against a defendant may raise the cost of directors and officers and other liability insurance for that party, interfering with an organization's ability to operate. A SLAPP may also intimidate others from participating in the debate. A SLAPP is often preceded by a legal threat. SLAPPs bring about freedom of speech concerns due to their chilling effect and are often difficult to filter out and penalize because the plaintiffs attempt to obfuscate their intent to censor, intimidate, or silence their critics.
Most commonly used in taxation cases. Strange coincidence as that may be.
It's deliberate indirect intimidation aimed at forcing organisations to not be openly GC for threat of the cost of defending such actions even if they are slam dunk wins.