You can (sometimes) use GitHub to figure out if the company has bad work/life balance, e.g. if you see lots of employees committing code on the weekend on the same dates: https://codewithoutrules.com/2019/01/31/does-company-have-wo...
The other edge case would be an environment where every employee is super active in OSS.
Currently I have a separate ‘home’ account for personal projects and I never touch the work ID from my home.
Also, you could and probably should create a new SSH key on the company laptop or a personal access token for HTTPS access so that it can be easily revoked when you leave.