I haven't seen anything about salary / payment / whatever in those clauses. To agree to work OT is one thing - to get paid is totally another and as someone said, mandated by law. Maybe (?) if the contract says you agree to work 24h / day with this salary then it would be OK?
Of course, in IT over 35 years I still have to see a job which wouldn't require you to work OT sometimes. Computers just don't sleep..
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