Q458: Does a Giant Spider's web restrain swarms (that are not spiders)?
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Web: Ranged Weapon Attack: +5 to hit, range 30/60 ft., one creature. Hit: The target is Restrained by webbing. As an action, the Restrained target can make a DC 12 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 10; hp 5; vulnerability to fire damage; immunity to bludgeoning, poison, and psychic damage).

All swarms have Condition Immunity "Restrained" however only swarms of spiders "ignores Movement restrictions caused by webbing."