I actually talked about this a few times on my Twitch stream in the past weeks. I pointed out that having 10 alts without any cards, so an investment of a hundred dollars, will give you more than a thousand rewards chest in just a year if you just push them to bronze 3 every season. As such it's more profitable to just buy alt accounts than cards.

As a solution I was thinking towards a possibility of having minimum season rewards chest start at a certain collection score, something like 500 or a 1000 points. This change is something I didn't expect but not necessarily hate. I'm interested in how this pans out.

The only concern I might have is that new players might have "fake expectations" when opening chests and after x amount of times of finding potions or a few DEC they quit not knowing that a higher collection score would not only increase the quantity of reward chests but also the quality. My "solution" might have been simpler in that regard, but if this is communicated well to new players I can see this work as well.