They did, and stopped doing it a few years ago: https://forum.thinkpads.com/viewtopic.php?t=125905

IBM Thinkpads did. Lenovo Thinkpads are not the same quality.

I've personally spilled about the same number of drinks into one IBM Thinkpad as I've completely fried Apple laptops with; about 3-4. The Thinkpad would probably still work today.