Update: A recent news update had indicated that things were already safe for the sales of BLU smartphone to resume at Amazon as if it all turned out to be a false alarm.
A bigger lesson than the one for Windows 10 was learnt as the spyware technology was removed in the devices. However, from the deeper report from the researchers, the data collection is still there via the telemetry in which the data collected is stored in the servers in China. Furthermore, the researchers have fears and concerns of security risks for servers in China.
Another concern is that the BLU smartphones are banned from sales by Amazon as it may seem to be an offense to Amazon like selling a phone, tablet, set-top-box, a computer or any other computing device pre-loaded with spyware is an illegal act and an individual, group or a company can be in deep trouble for that sort of sale.
It is controversial ever since last year in which those smartphones were pre-loaded with spyware but until the illegal data collection is completely removed including the telemetry, there will be no point in getting them available according to Amazon.