Or just a lot of smaller hearts.

It's just a unique ID of a person, it's not a password. I don't see how you can be confused by this.

The graph showing that "Bank teller employment has fallen off a cliff" is not zero based. This is pretty damn bad. The graph looks like it's going down 90%, but it's actually going from 350k to 150k. That's a ~60% drop which is a lot, but not "falling off a cliff".

Less expensive how? The reason GPUs are used is because they are more efficient. You CAN run matmul on CPUs for sure, but it's going to be much slower and take a ton more electricity. So to claim it's "less expensive" is weird.