Grammarly in Signal

My Signal app is highlighting words to correct grammar and when I click on it, it says it is being done by Grammarly. I don't have Grammarly installed on any of my devices or as a plug-in to any browser. I'm confused because Signal is supposed to be a privacy and security concerned app, and Grammarly is a keylogger. Is there a way to disable Grammarly in the Signal app? Why would Signal be incorporating them in the first place? …

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