RoboKiller said it detected more than 7.4 billion spam texts in March alone.
Courts and regulators have in the past shut down scammers who used Amazon’s name.
The scammers earn fees from advertisers and websites for generating traffic, Amazon says.
Amazon sues text scammers who it says used company name to gain clicks
A lawsuit filed in federal court aims to widen Amazon's investigation into scammers who flood phones with fake deals and discounts.
