Arnon Nampa received a total sentence of over 34 years for violating Thailand's lèse majesté law.
The law carries prison terms of 3 to 15 years for perceived insults against the royal family.
Since 2020, 294 people have been prosecuted under the law, with some receiving up to 50-year sentences.
Critics argue the law is used to suppress public debate and is applied with extreme ambiguity.
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