AFAIK it has nothing to do with mining. It is more or less a slot lottery so investor can get the allocated slots to buy the token. For example, a project needs to raise $100k, and each investor can contribute $1k at most. That means there will be 100 slot. That's where ame or whatever it is called comes into play.
Yap, I guess same.
Just read how "AME (Allocation Mining Event)" work :
https://launchpool.medium.com/launchpool-announces-first-allocation-mining-event-for-unizen-ace69fda6cfa IMO, nothing different at all the main points just "More token to be stake & more longer stake you have" more chance you get.