I think the product was just too early for its time, and there is not much demand for it. For what it's worth, the founder (Ren Ng) went back to academia, and was highly instrumental in computer vision research, e.g. being the PI on the paper for NeRF: (https://dl.acm.org/doi/abs/10.1145/3503250)
I don't think it was quite too early, it just makes tradeoffs that are undesirable.
Lytro as I understand it, trades a huge amount of resolution for the focusing capability. Some ridiculous amount, like the user gets to see just 1/8th of the pixels on the sensor.
In a way, I'd say rather than too early it was too late. Because autofocus was already quite good and getting better. You don't need to sacrifice all that resolution when you can just have good AF to start with. Refocusing in post is a very rare need if you got the focus right initially.
And time has only made that even worse. Modern autofocus is darn near magic, and people love their high resolution photos.