I was just scrolling through facebook and I found an ad Office 2019 Professional Plus Retail License Key - DigiSoftMart which was selling this MS office keys intially I was skeptical but Facebook is consistently recommending this website ads and they seem to be genuine as I see positive reviews mostly in comment section. I am wondering how they gets keys this cheap and are they legal to use? Will I get into any problem for using those keys other than the risk of losing the amount I paid.