I believe BBYY had their “Vortex” yoyo that was a resultant of their capabilities at a trade show that were given away to business prospects, and sold to those who were interested.
I think the owner was just too busy with his day job to keep up with the industry and (possibly) lost interest. The Juvenile Offender was one of my favorite yoyo’s to date. I think the size scared a lot of players off at the time of the yoyo but I also think it set a bar for a lot of oversized models today, along with the Severe 2010.
As for String Theory, due to personal reasons, the owner is or was on hiatus.