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Their Bionic Eyes Are Now Obsolete and Unsupported
(spectrum.ieee.org)
This is a most excellent place for technology news and articles.
The number of blind folks who are receptive to electrical retinal stimulation was always too small for this business model. These crooks knew that and pumped investors for a non existent hope that this would somehow translate into a non existent technology. Suprise suprise, you can't magic your way into these things.
The entire operation was always doomed to turn out this way.