This is definitely more a thing in continental European or Arab cultures than American culture, but I have been platonically kissed on the cheek before as an adult even in America. Interestingly, I've also read that lip-kissing can be platonic in certain cultures too or even economic systems as was the case with the "Socialist Fraternal Kiss" during the days of Communism.
So what do people personally think of platonic kissing? I think I like cheek kissing and forehead kissing that is more affectionate and caring in nature. Hand kissing to me almost seems too servile and distant to be appealing, and on the flip side for me, lip kissing then seems like it's too much, though I would respect the custom in a foreign country or when meeting with an important official visiting the USA.
I think I'm not opposed to platonic cheek-kissing being a part of cuddling as well, though I would follow whatever the rules are for the session (terms of service as well for any site) and also recognize the concern that kissing is still much more associated with romance in American culture than elsewhere.