I would say that ANY investment should be met with an appropriate amount of DD until the investor is comfortable with the knowledge gained...however, if the knowledge is tainted so as to mislead the investor...well, that would require a whole new level of caution and this may be the case here as history has shown there is taint involved IMO.
Section 27A -- Application of Safe Harbor for Forward-Looking Statements … b. Exclusions.
Except to the extent otherwise specifically provided by rule, regulation, or order of the Commission, this section shall not apply to a forward-looking statement--
1. that is made with respect to the business or operations of the issuer, if the issuer—
9/ The District Court rejected the first defense because the statutory SAFE HARBOR does not apply to Commission enforcement actions, or to penny stocks, like UNDR stock, citing 15 U.S.C. §§ 77z-2(b)(1)(c), 77z-2(c), 78u-5(b)(1)(c), and 78u-5(c). ...