* First, if the spammer is coming from a "good" instance, the admin of that instance can ban them—and the number of instances means that there are more mods to go around.
* Second, if the spammer is coming from a pure spam instance, other instances can ban/unfederate with the whole instance.
Mastodon has a couple of key advantages, though.
* First, if the spammer is coming from a "good" instance, the admin of that instance can ban them—and the number of instances means that there are more mods to go around. * Second, if the spammer is coming from a pure spam instance, other instances can ban/unfederate with the whole instance.
That said, it's an area that the community is focused on. Here's an issue discussing spam and additional tools that could help: https://github.com/tootsuite/mastodon/issues/8122