When I look at Mastodon posts, I see a decent amount of replies and boosts for popular posts, but not very many stars (see example image). I assumed a star is the same as a like, but I feel not a lot of people star a post, whereas I did see a lot of hearts/likes on Twitter posts. Are they not equivalent?
As said above, likes are virtually useless. They're more like "noticeable bookmarks". Mastodon etiquette is to boost rather than like, if you enjoy a toot, and that's also how it was when the Twitter timeline was chronological and didn't include likes, a very long time ago.