Did you also note the rule below, it seems they will be able to sell preferred shares to "accredited investors" (banks , brokers?)

Quote:

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The company cannot use general solicitation or advertising to market the securities;
The company may sell its securities to an unlimited number of "accredited investors" and up to 35 other purchases. Unlike Rule 505, all non-accredited investors, either alone or with a purchaser representative, must be sophisticated—that is, they must have sufficient knowledge and experience in financial and business matters to make them capable of evaluating the merits and risks of the prospective investment;
Companies must decide what information to give to accredited investors, so long as it does not violate the antifraud prohibitions of the federal securities laws. But companies must give non-accredited investors disclosure documents that are generally the same as those used in registered offerings. If a company provides information to accredited investors, it must make this information available to non-accredited investors as well;
The company must be available to answer questions by prospective purchasers; and
Financial statement requirements are the same as for Rule 505.

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Rule 506 of Regulation D

https://www.sec.gov/answers/rule506.htm