I will not vote for anything that nerfs rentals. It's too shortsighted. Since the goal here is to target bot farm accounts that only play SB cards, why not simply remove rewards for SB cards? The SB conundrum was a team creation unfortunately... in the past reward card sets were MUCH more limited in scope. Meaning you could not possibly win playing only reward cards. There were too few and only a few from each splinter. The SB reward set was TOO BIG and also unfortunately included summoners, allowing bot farm accounts to rent for a short time and then play using SB cards exclusively.
Yes rentals are cheap right now because of both overprinting and fewer accounts playing, but RB rentals are much higher than other editions due to scarcity (which is due to excessive cost imo but that's another conversation).
The narrative has also shifted from 'new players should play modern so they don't have to face older expensive/powerful cards' to 'new players should play wild because there are lots of low level bots that are easy to beat'.
New players will NEED To be able to rent cards and earn otherwise they will never buy. Modern is basically hell for new players right now and I believe SB and Glad cards will unfortunately only perpetuate/maintain that scenario. Nerfing rewards for rentals goes against core principals of the game.