You should compare this to the cost of buying an FPGA. It can be cost-effective.
The list price of a Vu9P is like $50,000. I'm sure that's not the real price, but still.
This is about half as powerful but comes preassembled and ready to go. Also "only" $500
The AWS FPGA offering only makes sense if you absolutely need a massive FPGA connected to massive amounts of RAM, and don't want to spend the bucks to own it yourself.