Why can't Miles Morales join Spider Society in Spider-Man: Across the Spider -Verse?

Why can't Miles Morales join Spider Society in Spider-Man: Across the Spider-Verse? There will be major spoilers for the film ahead.

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And then people gonna pretend that woke not trying to replace Spider-Man, with Miles Morales. : r/FuckMarvel

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The times we live in are so odd: Miles morales aka Spider-Man VS Security Officer : r/securityguards

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