If I recall correctly, Tesla open sourced their patents in 2014. Couldn't other car companies implement their own version of Tesla's equipment and skip a signif

If I recall correctly, Tesla open sourced their patents in 2014. Couldn't other car companies implement their own version of Tesla's equipment and skip a significant portion of the R&D needed for EV development? Obviously that would take more work than just buying directly from Tesla, but if they built their manufacturing line to supply their own Tesla-invented tech then they should be able to sell it to other manufacturers, right?