https://wccftech.com/nintendo-switch-online-expansion-pack-improved/

The Nintendo Switch Online service and the Expansion Pack tier will continue to get improved and expanded in the future, Nintendo revealed in its latest Corporate Management Briefing.

The briefing also confirmed that the Nintendo Switch Online service reached 32 million subscribers as of September 2021, so a few days before the Expansion Pack tier launched. The last known figure was 26 million as of September 2020, so the service has seen an increase of 6 million subscribers in one year.