Lots of profiles still have this link
I have in my profile a link to the legal fund campaign (and in addition a link to a novel open source collective that is trying to build an alternative to Stack Exchange.).
The same is true for several profiles in the top of the stackexchange that I frequently visit.
There is also no legal reason to have the link removed
I see not why this link on a profile page is not within the rules under which I have granted the license to SE/SO to use the material that I write.
The contributers to SE/SO license their material to SE/SO under the terms of a cc by-sa with attribution license. Because of this they will expect that anybody that publishes their material (including SE/SO) will place their name (or whatever they desire) allong with the material, and include a link to their user profile.
It would be a violation of the license and illegal distribution of the licensed content when SE/SO starts to adapt user profiles and restrict the content within tighter boundaries than those that are not laid out in the rules of the acceptable use policy.
There is one important rule in that acceptable use policy that might be related to placing links such as decribed by the OP, or at least it comes closest to it (other rules relate to 'Illegal Use', 'Identity Theft and Privacy', 'Hate Content, Defamation, and Libel', 'Disruptions and Exploits', 'Copyright', 'Mass Registration and Automation', and 'Sexually Explicit Material')
Spam. Users that do not publish meaningful content, use deceptive means to generate revenue or traffic, or whose primary purpose is affiliate marketing, will be suspended.
However, this relates much more to other practices.
E.g. It would mean somebody generates creates an account and makes only/mostly meaningless content with it, use deceptive ways to generate traffic (the links to the legal fund campaign are generating revenue or traffic, but not in a deceptive way, and neither is it with the primary purpose of affiliate marketing).
This does not relate to regular users that happen to have a GoFund Monica link or Codidact link in their user profile.