Yeah, that is what people like to think. But when they support the use of bots openly, it is no longer a good excuse for doing things that affect players negatively in my opinion. The bots are still going to just farm credits and then buy cards and sell them for DEC.
This specific change really is not all that bad. Depending on the credit reward amounts, a bronze player's earnings probably aren't going to change too much.
i would not say support, more like not actively trying to stop them. they will farm credits but will have to go to the market and buy cards (more hassle, some fees for that). Also depending on the amount of credits, new players will be able to pick cards they want to buy not just reward cards. Less opportunity to get a legendary in draw but more opportunity to get a card that you need.
we will see what will happen.
When I say they openly support bots, it is because they have literally said as much. Anytime they are asked about it, they say bots are good and defend their use. Also, any time they make a change like this, they purposely do not mention bots, people just assume it is bots. They don't mention bots because they support the use of bots. What they are actively trying to stop is people with multiple accounts making a lot in bronze. That is it. Not bots. They're okay with bots. Granted people are using bots on a lot of accounts to take advantage, but this is still my point. If they openly allow the use of bots, it is no longer a good excuse for degrading the new user experience, in my opinion.