As a 70-qubit quantum computer, it’s not going to be doing many helpful calculations. The benchmark used is random circuit sampling, which is doing a bunch of random quantum operations, and then reading the result, and it is compared to a supercomputer simulating the various random operations. This algorithm isn’t useful outside of benchmarking.
This also makes Sycamore a particularly ineffective “weapon” considering that we don’t really use encryption that’s less than 1024 bits, which is well outside of the capability of our current quantum computers.