astrange parent
You could still do it with a USB capture card or an SDR. Analog capture certainly isn't dead though it might be a little expensive.
Yes, the only problem is the price.
Analog TV tuners were very cheap. Now it no longer makes sense to use an expensive analog capture board for a RNG.
There are much cheaper solutions.
For no more than $10, you can make a RNG using the ADC of either a microcontroller board with USB interface or of an audio USB dongle or of the microphone connector of the motherboard audio.