Over the last couple of years, the Performance Marketing Association has done a substantial amount of work regarding Downloadable Software Publishers (toolbars, extensions, etc.) as well as attribution in affiliate marketing. Here are a few of those resources:
The PMA Compliance Council is tracking the lawsuits filed by influencers and other publishers based on various attribution practices–generally last click attribution awarded to toolbars and browser extensions.
Honey (Young v. PayPal, Inc. et al) United States District Court Northern District of California, San Jose Division, filed 1/3/25 (Complaint)
Capital One (Coleman v. Capital One Financial Corporation et al.) United States District Court for the Eastern District of Virginia, Alexandria Division, filed 1/13/25 (Complaint)
RetailMeNot (Oganesyan and Ely v. Retailmetnot, Inc.) United States District Court for the Southern District of New York, filed 1/27/25 (Complaint)
Microsoft (Storm Productions LLC v. Microsoft Corporation) United States District Court for the Western District of Washington at Seattle filed 1/31/25 (Complaint)
Klarna (Thompson v. Klarna Inc.) U.S. District Court for the Southern District of Ohio, Columbus Division, filed 2/1/25 (Complaint)