It doesn't have to be a norm across the leagues. Like for example, don't some teams in leagues, signify the stars on their crest to suggest CLs won? Bayern for example? As for Juve, I think it was spoken about repeatedly even before we won the tenth cup so yea it was definitely a thing. Whether we put it or not is another matter, but it was a huge motivation for Juve to get to the tenth cup and I'm pretty sure this was part of that motivation. That said, we haven't had it all these years so I'm guessing Agnelli doesn't want to start a trend for the upstarts.
Their 4 stars represent league wins just like ours. They don't have 1 star per 10 wins though, like us. It's some really odd system that doesn't make sense whatsoever.
I think you get your first star at 3 league wins, then another at 5, then at 10 and you get your 4th after your 20th league win.
