I suppose what is so interesting about bitcoin is that you could download the whole bitcoin core, for only about 500 GB of data? That is actually pretty small, considering that you could buy a flash one terabyte hard drive for maybe nowadays only 80 bucks? So in theory, for around $40 USD, you can store all the bitcoin node information?

Check your bandwidth and space

Bitcoin Core requires a one-time download of about 500GB of data plus a further 5-10GB per month. By default, you will need to store all of that data, but if you enable pruning, you can store as little as 6GB total without sacrificing any security. For more information about setting up Bitcoin Core, please read the full node guide.