Daimler (parent of Mercedes) reportedly rented Model X and disassembled it to learn how it works. https://www.popularmechanics.com/cars/a14106521/competitor-t...

Munro & Associates did a complete Tesla 3 teardown and disassembly in order to sell what they've learned to Tesla competitors for hundreds of thousands of dollars (https://www.youtube.com/watch?v=CpCrkO1x-Qo&t=4828s)

So did some German engineering company (https://cleantechnica.com/2018/02/19/tesla-model-3-stuns-ger...).

Apparently there are plenty of companies interested in how Tesla's cars are made.