I tried mining this coin, but there is a very small profit on video cards due to the large influx of miners for this coin.
Can FPGA miners mine this coin?
If the hashrate of the network is 22 TH, and the hashrate of the RTX 3070 video card is 800 megahash, then there are 27500 RTX 3070 video cards in mining now.
I don't know if there are any ASICS currently running Radiant.
Since a few weeks it is also possible to run with AMD and not only with Nvidia. After 3050Ti, 3060, 3060Ti, 3070, 3070Ti but not only, a lot of 3080, 3080Ti and especially 3090, 3090Ti, the latter which apparently allows to produce 1,7 ~1,8 GH/s per card according to some! There is an estimate of over 3.5GH/s for the 4090 which is coming in less than a week! Add to that the fact that many operators are renting GPUs. That's impressive! Maybe these operators are making a bet on the future, although I don't know what the future holds.
What the difficulty history shows is that there is a lot of hashrate following a call during Ethereum's The Merge there was a considerable influx of hash power. Forced to note that the operation of exploitation seems profitable especially for those who have electricity at very low price.

See here for a statistical snapshot of one of the pools operating Radian, there are several pools in operation.
At the same time it seems that technically Radiant is well above the rest. Who knows maybe with adoption, good apps and good marketing maybe Radiant could one day go to the top 50 of Coingecko / Coinpaprika / Coinmarketcap. I wonder though if the business model deployed by proof of induction will be sustainable for the market players as it pushes operators to break the fee prices, or it will require very high volume. Let's see what happens next.