The answer is similar to the answer of, “Do large corporations pay taxes?”
Technically, large corporations pay taxes and there’s limits to how much an individual donates to a political campaign.
But, if the individual uses financial constructs such as SPACS and C-Corporations, they can effectively donate as much as they wish, and even do so covertly.
It’s like most anything else: The rules are constructed for and enforced inversely proportional to fiscal class.
Small groups can make a substantial difference by using these tools for “good”. A fantastic example of an idea that scaled beautifully is Proton, a C-corp, soon to be majority owned by a trust with zero liabilities, soon forever subordinate to the principle of privacy in digital services.