I used gp3 instead of gp2 because I thought gp3 is also free tier. However it is not. After a long waiting time, the customer service eventually let me changed back to gp2 and exempted the fee. Great! The only thing to complain is that the instruction in setting up a new instance is not very clear. I chose free tier and yet it allowed me to use gp3. 3 stars only.
