As mentioned in the report, that's the maximum that the FCC can levy on a licensee that fails to adequately answer a (not enforced by subpoena) Letter of Inquiry ("failure to respond to Commission communications").
In paragraph 49 they mention that they may start applying much larger fees to companies with that kind of revenue to discourage thinking of that kind of fee "as a cost of doing business".
In paragraph 49 they mention that they may start applying much larger fees to companies with that kind of revenue to discourage thinking of that kind of fee "as a cost of doing business".