GrinInfluencer-marketing platform Grin has been impacted by layoffs.The company helps facilitate influencer-marketing campaigns and provides other creator tools.The company cited "ongoing changes in the global economic environment" as a reason for the cuts.The influencer-marketing platform Grin has laid off "many" staffers — in the company's third round of layoffs in recent months — a spokesperson confirmed to Business Insider.Grin is a platform…