I think largely it depends on individuals and their responses to advice. When I gave my babies away, I gave out full Care Guides and, if possible, Friended them on Facebook. A few of them give me regular updates, post videos and photos, and chat about them. I'm over the moon with these owners.
I have had one, however, who got two from me. Her mother-in-law has kept them before, and she contacted me to tell me she was getting them a heater. I instantly replied that axolotls don't need heaters - if anything they love chillers! - and after that I never heard from her again.
Another example was the LFS I gave some babies to. A chap who works there took quite a few from me to raise himself, and then to sell in the shop. I pop in about once a week to check on them and up until now they've been good - small, but good. I went in a few days ago and I saw three of my babies in with a massive school of White Fantails.
I wanted to cry. I'd specified that they weren't to be kept with anything else and even provided them with a full Care Guide. Here were the babies I'd raised from eggs, fed, cleaned, for three months. And one of them was being attacked by a White Fantail.
I went to the cashier, the same guy I'd given them to, all aquiver. I didn't want to cause any fuss - after all, my whole family buys from there - but I politely asked if my babies could be moved to another tank.
'Yeah, sure,' he said, and right away he moved to the tanks, spotted a Black Moor all on its lonesome, moved it to another tank and popped the three babies into their own little tank, with a log and moss and everything. I was so happy!
My Dad, not so much. I can't include the 'choice words' he used but suffice to say he wanted to know why I was making such a fuss, especially seeing as he has to go in there.
Well, I didn't bring these babies into the world for them to suffer. Sometimes you have to stand up for what is right. Even if you stand alone.