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by klyrs 1921 days ago
Marsh v Alabama is a pretty narrow ruling, and hasn't been interpreted to apply to much more than company towns, which are now illegal.

Cyber Promotions v AOL is a subsequent case which is much closer to today's question: Cyber Promotions wanted to spam AOL, and AOL wanted to filter out spam because it threatened to ruin the internet. Thankfully, AOL won that case, and spam filtering is constitutional.