I will provide a concrete example, even though I am not the parent commenter. I work for a FAANG company in a reasonably senior role. I have carveouts in my employment contract that I negotiated when I started a few months ago, because in addition to my day job, I co-own a coworking space with my wife (and she owns other businesses that I do some light tech work for - site maintenance, office network, etc).
My day job is very demanding, but my leadership team are aware, and the HR folks at my employer have documentation that supports me having a side business, and so if I say things like "I have to go the bank/lawyer stuff for my business", no one bats an eye as long as I am hitting my targets for the day job.
The expectation is that I will largely be available and focused on my day job during the 9-5, and where needed, provide support on escalations/on-call.
If I started taking on consulting contracts or was regularly juggling contracting or side-job related tasks against my day job, then it wouldn't be a good fit for delivering on that 9-5.
My day job is very demanding, but my leadership team are aware, and the HR folks at my employer have documentation that supports me having a side business, and so if I say things like "I have to go the bank/lawyer stuff for my business", no one bats an eye as long as I am hitting my targets for the day job.
The expectation is that I will largely be available and focused on my day job during the 9-5, and where needed, provide support on escalations/on-call.
If I started taking on consulting contracts or was regularly juggling contracting or side-job related tasks against my day job, then it wouldn't be a good fit for delivering on that 9-5.