Short answer
Basically the hostages who were released told how they were treated worse than prison inmates. For example: barely given any food, no showers or beds, children forced to watch the massacre of October 7th and threatened with being shot if they cried, forced to write positive letters about their treatment for propaganda, no medical help, etc.
A Thai hostage tells about how he was treated by Hamas and how the Israeli hostages were treated
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Some of the hostages provide highlights about their imprisonment
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An article describing the sexual violence Hamas’s hostages suffered
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Doctors confirm that many of the released former hostages, including minors, suffered sexual assault
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Hamas tried to forcefully convert at least some hostages to their interpretation of Islam
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