8. Right now the spam problem is one idiot gamer in Japan. But the next stage will be sleazeball marketers (anyone else remember Canter & Siegal from the first time round?)
9. There will be toolkits to send marketing spam, not because Mastodon users are the target, but as a route into Threads, Bluesky, and other commercial media with a mass user base.
10. Added lulz: the Mastodon Taliban (who hate Meta) may even start spraying spam just to force Meta to defederate from the wider fediverse.