Effects that affect a large number of objects, like "all creatures" usually do not target. Just being affected does not make an object or player a target.

Protection from X only does four specific things (remember them by DEBT):

D amage from sources with X is prevented
E nchanting/equipping/fortifying by X is not possible
B locking by X is not allowed
T argeting by X is not possible

115.10. Spells and abilities can affect objects and players they don’t target. In general, those objects and
players aren’t chosen until the spell or ability resolves. See rule 608, “Resolving Spells and
Abilities.”

115.10a Just because an object or player is being affected by a spell or ability doesn’t make that
object or player a target of that spell or ability. Unless that object or player is identified by the
word “target” in the text of that spell or ability, or the rule for that keyword ability, it’s not a
target.

115.10b In particular, the word “you” in an object’s text doesn’t indicate a target.