Likely ads targeting. Twitter had a bug where they would track you around the web even if you opted out... this was obvious for years because you'd immediately

Likely ads targeting. Twitter had a bug where they would track you around the web even if you opted out... this was obvious for years because you'd immediately start seeing ads for specific drugs if you searched for a medical condition in a separate browser etc. Instead of actually fixing the issues, they removed the ability to opt-out of personalization (lol)