However, these long term holders who bought in 2015, bought with...

However, these long term holders who bought in 2015, bought with the focus of seeing the AKIDA1000 commercialised (I assume).

In the 5 years that have transpired, holding, and investing in Brainchip has become a whole lot less speculative!
They have:

1. A wafer fabricated and Internally Validated Chip
2. Early Access Customers including NASA (confirmed via ASX announcements and clarified through Ken)
3. Secured More than substantial capital support through Put Option Agreements with LDN

_{This funding negates any going concern problems for the next 3 or more years! This would also allow Rob Telson and Todd Vierra to negotiate contracts to the best of their ability. Brainchip now does not need any funds and the Tier One Companies have less bargaining power to license the IP or purchase the NSoC cheaper! Therefore a deal that suits both parties (mostly Brainchip) can be made!}
4. Brainchip has plans to Produce Production Masks in early Q1 of 2021 leading to eventual manufacturing and assembly of the chips
5. Boards have either been sent out or being sent out by end of this year to numerous EAP customers

There is much more information that I have missed about how Brainchip has turned from a speculative company, into a company with serious upside and minimal risk!

Brainchip has gotten a lot more exposure too, and there should be more too come in the future!

As you have said DYOR
This is just my opinion that I'm sure numerous other well-researched holders have!