I think it’s also an economics thing. Sochi is a ghost town, because after the games ended, there was no basis to support the stadiums and infrastrcture. Cities like Rio and Athens built up to host the village of international competitions, but there was no funding to keep them up after it was all over. Vancouver, Sydney, Los Angeles, London, Tokyo, Beijing, these are thriving cities with high concentrations of wealth that planned for how to repurpose the infrastructure after the games. The residential spaces became hotels or were otherwise repurposed, and the stadiums and training facilities are being used for sports and recreation.

People still visit Salt Lake City, Utah, to ski the slopes where the Olympics were held. Meanwhile, Sarajevo can’t reopen the ski jump or the bobsled track from 1984 because of the land-mines left there in the 90s.

So it’s probably not as much winter/summer as it is have/have-not.