1. PR people didn't really understand what was going on
2. Ppl at the company didn't expect retail traders to understanding what was going on.
3. They had trouble with regulation in the past and are trying to appear as a legit brokerage.
4. Maybe they figured that they could get enough capital quickly enough to open up trading again or they were in active negations with DTCC. (Which they sort of did.)
EDIT: Formatting