This is not true without qualification.

Non accredited investors buy securities all the time through their brokers.

Advertising to general non accredited public for unregistered securities may get you in trouble with sec.

Selling unregistered securities to non accredited investors happens all the time through private placements.

I think a good argument can be made that a law restricting the sale of non-registered securities to wealthy ("accredited") investors and excluding poor people violates the Equal Protection clause of the 14th Amendment. (And, although the 14th Amendment applies only to the states, the Supreme Court has held in Bolling v. Sharpe (1954) that the same principle operates against the federal government via the Due Process clause of the 5th Amendment.)

Do tokens fall under that category ?