What people here often forget is just how few people IRL even use Reddit as social media. Even those who are fairly technically minded. Like, they may even have an account that they use to converse with people about a specific matter, then when their issue is resolved they set Reddit aside and don't visit the site again for months.
Also, we know how subscriber numbers are highly inflated. Many of us had multiple accounts ourselves, to help separate different uses (e.g. a mod and non-mod account to use for testing purposes).
People not using Reddit seems odd to us because it does not match our experiences, as users of Arch btw, but it is true in the wider world.
Edit:
Interesting...
Most graphs that I saw describing stats for which social media platforms don't even bother showing Reddit at all.
The "What Are the Most Used Social Media Sites in the US?" table from the latter website is particularly interesting... Reddit is #12 with 695 million active users worldwide, just above Weibo and Pinterest and X and Q (??), and behind Kuaishou, Douyin, and Snapchat. WeChat has twice as many users. Tiktok has 1.94 billion users so nearly 3 times as many users. Facebook has 3.07 billion so >4.4 times as many users.