Reddit has enabled Community Leaderboards

From the Reddit Support page:

What is the community leaderboard?

Communities that have community achievements enabled have the option to showcase community members who have received an achievement badge as a top commenter or poster (Top 25%, 10%, 5% and 1%) in a community leaderboard. The leaderboard will feature the top commenters/posters and stack rank them based on total upvotes from their contributions for the community to see. These rankings will be updated daily.

Redditors can access the leaderboard through the Top Members entry point at the top of the community page.

Please note that this won’t be made available to Not Safe For Work (NSFW) and private communities or with less than 100 members. Additionally, actioned accounts won’t appear on the community leaderboard. Only redditors with 100 monthly upvotes or more will be eligible to participate in the leaderboard.

For communities that aren’t interested in this feature and wish to disable it, mods can do so in the Achievements section in their mod settings under Community Leaderboard.

Currently, the community leaderboard is only available on Android.