RocketLab (https://www.rocketlabusa.com/) services a slightly different segment (i.e. not as heavy) but does take things regularly to space (and in the case of Capstone, to the moon!)
RocketLab has not had much success in raising its launch rate. Meanwhile SpaceX undercut them on $/kg with their rideshare program which likely robbed them of a large number of potential customers, so RLs segment was not as separate as they would have liked. Indeed in their short history SXs rideshares have launched considerably more payloads and more weight than RL in their whole history. There are of course some payload's that want to go to a specific orbit not served by SXs rideshare.
Yes its David Vs Goliath, but that sums up all space companies not backed by billionaires or Government Pork. saying that I am rooting for both to succeed.