eBird doesn’t obscure Snowy Owl, and only obscures Long-eared Owl in New York and Wisconsin. Their sensitive species page states that Long-eared Owls are vulnerable to human disturbance at daytime roosts in some areas of the northeastern US, but that this is not an issue in the western US. I don’t see any reason why iNaturalist should obscure more aggressively than the Cornell Lab of Ornithology.
Great Gray Owl and Northern Hawk Owl are both obscured by eBird globally. Both species are listed as IUCN status Least Threatened, so it seems the concern is more for individuals than for the species as a whole. Leaving these two species unobscured increases the risk of human disturbance, but also creates opportunities to get more people involved with nature. These are both very charismatic species that can inspire a change of attitude for people who usually ignore birds or consider them nuisances. That may be worth the risk in areas with a healthy population of these owls.