For an automated bot making announcement-like posts, a Twitter page is simply a web page with subscriptions for those having a Twitter account: you naturally as

For an automated bot making announcement-like posts, a Twitter page is simply a web page with subscriptions for those having a Twitter account: you naturally assume everybody has a Twitter account and checks it regularly, or put more negatively, you ignore anyone not on Twitter. Mastodon would serve exactly the same purpose with the set of people being "ignored" being much larger. Email newsletter services would pretty much include everyone (on the internet, at least). What kind of bot did you run?