Alexandra Cirone

Elon Musk’s proposal for a Twitter Inc. subscription program has reignited the debate over the issue of spam and fake accounts that was at the center of the billionaire’s effort to get out of buying the social-media company.In a series of tweets this week, Mr. Musk said the program would give subscribers priority in replies, mentions and search, among other features. Current verified users who want to retain that status would need to subscribe to the program within a 90-day period,…