Professional services like IndexJump or marketplaces like Legiit typically follow a "governance-driven" path rather than a spammy one:
Buying Wikipedia links is fundamentally different from buying a standard guest post. Wikipedia is a community-governed encyclopedia, not a commercial directory. buy wikipedia backlinks
Instead of just "inserting" a link, they write 200–300 words of new, factual content for an article and use your site as the supporting evidence. they write 200–300 words of new
They identify where your brand or research is mentioned but not linked, then add a citation. then add a citation.