AntinaAnta Flarum adds rel="nofollow ugc" to all user-generated links by default to protect against spam and follow Google's recommendations.
The fastest way to change this is to install the luceos/flarum-ext-dofollow extension. Once activated, you can enter the domains (like your own website) that you want to have "dofollow" links. All other links will remain nofollow, which is a good balance for SEO and security.
Edit: I forgot to mention, the "main" SEO extension, v17development/flarum-seo also has the option.
