Well normally I'm absolutely against things like that. Not a fan of hacking or copying which will damage a company.
But this time Nintendo is just being weird again and creating this problem while it was easy to avoid... The game is so popular! Almost the best selling Switch game. Why didn't they release new amiibo cards or just a reboot of the old ones? They could've made a lot of money and keep everything pretty legal (sure not everyone will do that).
The cards are just too hard to get and the prices are insane. Who is going to pay €60/$60 for a specific virtual animal? Ok maybe some people with too much money but most fans will choose the cheaper way. But just fyi: haven't used a hacked amiibo myself haha