AITA for telling a rescue to not allow my ex husband and his wife adopt a large breed puppy

I was asked by a local rescue in our area for my opinion on whether my ex husband and his wife should fill out an adoption application for a large breed puppy. I know the lady who runs the rescue and I know she wants what is best for all of the animals in her care. I told her what I thought and it was decided that she would not be giving them an application. Now, the reason I told her it wasn’t a good idea is because my ex husband doesn’t have a livable wage at his job. His mom pays for his utilities and his college. His wife doesn’t work when she is capable of doing so. They live in a two bedroom house with 5 children (she has 3 kids from a previous marriage, I have a child with my ex husband, and they have a child together). They have gotten cats from local shelters and they always end up putting the cat outside and the cat runs away. They do this because they claim their child is allergic to them. Whatever, I don’t care about that. It’s irresponsible, but that’s not my business. BUT when I am asked for my opinion I will give it. They will simply not be able to afford vet care. They can’t even afford utilities or dependable vehicles. I didn’t tell her to not let them adopt a puppy out of spite. My ex husband and I get along really well. His wife is okay, we’ve never had words or fought or anything. But I just know that they’ll either kick the dog out or they won’t be able to afford to take it to the vet if something happens because they’re very irresponsible when it comes to finances. I’m just trying to do the right thing.