Not sure if you can zoom in on my avatar, but the chick in that photo had splayed legs and curled toes on one foot. We shackled the legs together with a small bandaid, (can use tape), at the ankle, so legs are about normal width apart. Fixes the legs in 24-48 hours, sometimes even less. I've put shackles on before going to bed only to wake up in the morning to find it has fallen off overnight but the chick no longer has splayed legs. Have read it isn't a deformity as such but more a cognitive problem when they first hatch and just need to be reprogramed on how their legs are suppose to be which is why having them on a none slip surface is so important. We use paper towel.
Curled toes can apparently occur due to fluctuating humidity during incubation, I find it most common in chicks that are breach in their shell and/or require assisted hatch. We place toes spread apart on round piece or half circle piece of tape or bandaid with another piece on top so they are sandwiched together in correct position. Again, usually fixed within 24-48 hours or less.
Although fiddly, both problems are very easy to fix and there are a lot of video tutorials on how to apply the tapes etc. Despite this I know some people prefer to cull anyway as they only want the fittest and strongest to breed with which is far enough and I understand. However, once fixed, you wouldn't know who had leg/feet issues and who didn't. And if literature is true and neither are actual deformities then I personally would prefer to try and fix.