unity 2018.3.7f1 just installed by itself!,Unity 2018.3.7f1 just installed by itself

i was just minding my own business, doing schoolwork and all of a sudden unity just installed on me, the hub didn't install it, due to myself having to tell the hub that it existed and i was doing nothing with unity at the time. why did this just happen? i'm really confused...

Edit: i just noticed how apparently the program's from February 2019, even though it's just appeared on my machine!,i was just happily doing my schoolwork and then i suddenly noticed that unity just installed itself! has this happened to anyone else, and more importantly, why would this happen?!