Comment by michaelt

Many of the provisions of the act apply to all user-to-user services, not just Schedule 1 and Schedule 2 services.

For example, the site must have an "illegal content risk assessment" and a "children’s risk assessment". And the children's risk assessment is a four-dimensional matrix of age groups, types on content, ways of using the service and types of harm. And it's got to be updated before making any "significant" change to any aspect of a service’s design or operation. It also makes it mandatory to have terms of service, and to apply them consistently. The site must have a content reporting procedure, a complaints procedure, and maintain written records.

Now obviously the operator of a bicycling forum might say "eh, let's ignore all that, they probably don't mean us"

But if you read the law and interpret its words literally, a bicycling forum is a user-to-user service, and a public forum is almost certain to be read by children from time to time.