Because it is and has always been intransparent about earnings structure (e.g. what percentage of money of a Tidelift subscription is paid out to maintainers),

Because it is and has always been intransparent about earnings structure (e.g. what percentage of money of a Tidelift subscription is paid out to maintainers), and thus has never achieved critical mass among maintainers. It also seems like they have mostly pivoted away towards software supply-chain analytics.