Hi @pierreto,
Thanks for contacting us!
With the new changes on rel tags, ThirstyAffiliates has a feature to insert additional rel tags to your affiliate links. You can find it on the individual affiliate link settings and apply the sponsored rel tag if this is important for your SEO link building strategy.
Here’s a screenshot example of the setting: https://snipboard.io/7DvgjZ.jpg.
According to this article, you can use the sponsored attribute to identify links on your site that were created as part of advertisements, sponsorships or other compensation agreements. If you consider your affiliate links as an advertisement, sponsorship or alike, you can use this rel attribute so Google can crawl and identify the link as a sponsored link.
I hope this helps! Let me know if you have any further questions.
Best regards,