Why isn't Google Indexing Discourse? SEO concerns

[IAmGav (Gavin Perch)]

here is an extract from Google

The indexing of your content by Google is determined by system algorithms that take into account user demand and quality checks.

Introduction to Indexing | Google Search Central  |  Google Developers

Also remember that only TL3 and above users has the no follow links disabled.

Here is something to read

Nofollow link settings

By default, all user submitted links will have a nofollow attribute added to deter inappropriate or potentially damaging behaviour. This includes all links on user profiles, as robots.txt ignores all profile information. However, there are exceptions that can be managed by admins to improve the relevance of certain links to your site and your trusted users. Exclusions: Staff posts - as the setting suggests, this setting applies to users. Staff are presumed to act in the interests of the site…

In other words, my posts has more “weight” than your posts.