In a support discussion titled “Unwanted follow link on profile page of users,” Jeroen_Van_Der_Mark raised concerns that user profile bios may contain follow links, which could harm SEO. codinghorror clarified that this is not accurate for anonymous users and that new users are sandboxed — meaning they cannot include any links in their profiles. Additionally, codinghorror pointed to the default robots.txt rules that disallow crawling of /users/ and /u/ routes, effectively preventing search engines from indexing user profile pages. Jeroen_Van_Der_Mark confirmed understanding and asked for clarification on whether established users (like moderators) can still include follow links — citing an example: https://forum.fit.nl/u/wesley/summary. codinghorror confirmed that while new users cannot post any links, established users may, but emphasized that such pages are still blocked from indexing by search engines. Jeroen_Van_Der_Mark thanked the team for the platform and the clarification.
Hi found out that the profile page text of users can be stuffed with follow links. This is something that you don’t want for you SEO. The outbound links are not automatically no-followed with the same rules that apply for the content generated on the forum.
So is it possible to include the same rules (no-follow the urls) on the profile page description/bio? 
First of all, this isn’t correct. Try viewing as an anonymous user. There are also special rules for new users where they are heavily sandboxed. (If you are talking about established users who have been on the site for 3+ years and posted many times, that’s different.)
Second, I would like to bring your attention to the following lines in robots.txt which is default for all Discourse instances:
Disallow: /users/
Disallow: /u/
Ah perfect @codinghorror
Thanks btw for the great platform!
This does mean this pages aren’t indexed/scrolled by crawlers?
For example a Moderator (of our website); had a follow link in his summary: Profiel - Wesley - FIT Community
Just to double check: new users can’t get a follow link in their summary?
Correct all /user/ and /u/ routes are disallowed from indexing by all crawlers in the world.
No links of any kind on the profile page are rendered for new users. Try it yourself if you do not believe me.