I don't know of a video I could link here, But as far as the cons of Ripping, In general:
If you rip a well-known avatar (Or an avatar from a well-known Creator) You're very very very likely to be found out, And either banned or at the very least, shunned from a lot of spaces that are against ripping (So, most places I assume.)
Personally, Another con of Ripping: you're kind of just robbing yourself of the experience/knowledge of avatar creation. But that's my personal opinion, And if you're not interested in avatar creation in the slightest, You can just disregard that.
Another con; If I remember correctly, Ripping can be rather tricky, Especially now that we can't have mods. I could be wrong, I haven't personally tried ripping in YEARS, And when I did, It was only 2 or 3 avatars for other people.
VRChat can catch onto these things relatively quickly and easily now, I believe. So if you really want to rip avatars, Be wary of that. EAC (VRChat's Anti-cheat system), Aswell as most Anti-Cheat Systems, Install spyware onto your computer and I'm not sure if that has anything to do with how they catch rippers.
I hope this was atleast a little bit helpful, If not, I apologize. Have a very very wonderful day