This is because they've done shady security and privacy-related stuff in the past, for example, shipping laptops with malware in 2015 or selling US Marines' laptops with altered hardware to send data back to China [1].

To make it worse, they also have weird practices regarding buying used products: they recommend you avoid buying used laptops (saying they might have viruses but later removed the page [2]) or saying that once you unlock your phone, you are not allowed to sell it [3].

TL;DR: Lovely machine, but I can't trust the company behind them.

[1] https://en.wikipedia.org/wiki/Lenovo [2] https://www.youtube.com/watch?v=Ahw1cppZi-g [3] https://www.youtube.com/watch?v=U2k9D81fbpA