In this case I’m not even making a judgement about the merits of WP Engine vs Automattic. IMO it is never OK to use your position as the sole steward of an add-on/extension marketplace to unilaterally take over a piece of software owned by someone else. It’s exactly the same as if Google “forked” uBlock Origin and took over the listing for it in their extension store at the same time. It’s completely against the spirit of open source, and any company doing it should not ever again be able to claim that they’re one of “THE open source companies in tech.”