If it’s the USA, then “iced tea” may actually mean “sweet tea” (an American South tradition), which is often prepared something like this:

• bring 1/2 gallon (1.9L) water to a boil
• place 8 large black tea bags in a 1 gallon (3.8L) pitcher
• pour boiling water over the tea bags in the pitcher
• steep 10-15 minutes, then remove tea bags from the pitcher
• add 1 dry cup (220g) granulated sugar
• stir the slurry until sugar is dissolved
• fill the pitcher to the top with ice cubes
• wait 20 minutes for ice to chill and dilute the tea, gently stir again
• serve

It may be a stronger tea, but so much sugar gets added (probably 3x what would be used to sweeten tea served hot) that you typically don’t notice any bitterness.