What's with all the chicken littles [ false paranoid worry warts ] .
Sure anything can go bad , if we all used the lowest common denominator thinking , we would do nothing .
Life is hazardous - ban it
I am just starting to collect used 18650's , 100's of them , mostly from laptops .
Depending but with most all packs being given to me because they no longer work , I disassemble , go through a series of tests , then at least a couple of charge discharge cycles , then find the milli amp hour rating , and classify them to about 10% of each other to make packs for future use .
With many out there doing the same , and making large home power supplies , like DIY Tesla power walls .
Like any other tech. you need to learn to do correctly , all kinds of nit-wits do stupid stuff .
To think / say and or use nit-wits as an example and never do anything that is not store bought , well - that just lets there be more for me