for me, I can't sing along if it's not close to the original because my brain remembers every tick of the original and wants to match the key of the original as well.

Also, I had a friend who got addicted to Smule which is an online sing duets with random strangers. It uses auto-tune so that anyone can enjoy themselves. I never tried it but he said it was amazing and he got a ton of joy from it.

Me, I like the idea that I can show off my amazing singing skills so if this auto-tunes everyone then that will go away. On the other hand, it's always been frustrating that box style karaoke places rarely have a large selection of western music (most of them are targeting the subset of their local market that would actually to got a box style karaoke place). My hope is that with this more of them will support just using the room as a place to use this service and then my friends and I can sing from a larger variety of songs.