Hrm, that list seems off. moa.party is an opt-in crossposter, where you have to authenticate to your account on both sides. Debirdify and Fedifinder are services to find your Twitter follows on Mastodon, based on pointers they've left in their bio, display name, or in pinned posts; they don't post anything.
That said, there are dozens of "BirdsiteLIVE" instances which are "public" crossposters (where you don't need to be, or get the approval of, the Twitter account being crossposted). A while ago in a thread on hachyderm.io's community issue tracker I came up with a list of a couple dozen without much effort.
That said, there are dozens of "BirdsiteLIVE" instances which are "public" crossposters (where you don't need to be, or get the approval of, the Twitter account being crossposted). A while ago in a thread on hachyderm.io's community issue tracker I came up with a list of a couple dozen without much effort.