When we flew to Israel with a stopover in a particular European city, I just couldn’t understand how so many of the frum passengers on our flight were sitting in the Starbucks type place not only drinking coffee, but using the milk that was served.
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Either a possibly misapplied use of Rav Moshe’s heter or members of a certain large Chassidus whose Rebbe told them they can use things they would not use at home when traveling. Both are acting well within halacha as they were taught it.
Those who were not using the milk are not in violation of any halacha whatsoever, except maras ayin as interpreted by Rav Yenteman. I was told very clearly by several of the most reliable sources in kashrus that drinking black coffee with sugar, hot cocoa with no milk (if it exists outside of where I am), and of course tea, is 100% mutar in a “Starbucks-type place.”