|The world has changed since COPPA rules started|
On July 20, 2020 the Federal Trade Commission published an FAQ page regarding COPPA compliance, and it is quite detailed and extensive, link.
The cutoff age is still 13.
The rule seems to exempt certain non-profits, depending on how they are structured. That might have potential significance for some content creators.
Compliance is required even if the collection of information is “voluntary”.