Part of the difference is that Twitter has much lower revenue per user than the ...

mrosett on Aug 4, 2020 | parent | context | favorite | on: Twitter faces FTC probe, likely fine over use of p...

Part of the difference is that Twitter has much lower revenue per user than the other two. If you frame the fine as "$X per user impacted" rather than as "y% of your revenue" then it seems more proportional.