Let's go back to how this started. Flightstats pulled the plug.

KVS instead of sending a "Sorry of the inconvenience but the flight availability feature is no longer available; here's a pro-rated refund or extension" email, provides some dodgy instruction on how to obtain a GTC account which was clearly not intended or available to the general public. Essentially KVS is having you, the donor, take on the legal risk of accessing a system which you have no permission to access so that he can keep his donations coming in.

If KVS is going out of business, it would be due to his PR skills (or lack of - especially with the bit about violating his ToS to provide the data sites it access when his tool is violating multiple ToS from the underlying data providers).

But I highly doubt KVS is going out of business. As KVS mentioned, the program is a tool (not a data service - no data center - no long term agreements with GDS etc). Initial development might have been an effort but the continuing updates is something a single individual could maintain so essentially KVS has low overhead associated with this program.