Simplified, Thinnet is just RG-58, and RG-58 is just coax that has a characteristic impedance of 50 Ohms, and 50 Ohm coax works just about like any other impeda

Simplified, Thinnet is just RG-58, and RG-58 is just coax that has a characteristic impedance of 50 Ohms, and 50 Ohm coax works just about like any other impedance of coax as long as the termination impedance is correct (or the length between terminations is 1/4 wavelength), and the attenuation is not too severe. One can send the whole RF spectrum down a single length of coax. The little pinkish-copper wires in your wifi gear are just coax. SATA cables: Also coax. Uncompressed HD video over SDI? Also coax. (But you asked about successes, not theory. I've run 5G cellular services through thinnet wire. Does that count?)