That is highly unlikely, such a mundane job as a sysadmin compared to having your own online business.
If he liked it that much, then probably he wouldn't have started a whole side project that must have consumed evenings and weekends for years.
If he would have found professional fulfillment in his job, he would not likely have started a side project in the first place.
As he mentions in his own reply, he stays because he feels that his job defines him as a person, and he would lose his social identity if he left.
This is a surprisingly lucid reply, he can do whatever he wants and I wish him the best, but it's clear to me that he has other much better options available.
Not true for everyone. I genuinely love being a sysadmin, or more accurately business recovery specialist. Rebuilding systems after a disaster with no documentation is genuine fun for me. Otherwise I'd have gone insane. However, I have other projects that I work on.
Your reply seems rooted in the fairly widespread assumption that having your own online business that makes solid "mrr" is some kind of supreme achievement and you should relish in it solely.
Some people have higher-dimensional desires and interests in life.
I have a simpler explanation, what likely happens is that most people don't even try to do it (even though they could do so like the case here) because it's different than the social norm, which says that you should be an employee working for someone else.
I'm saying that there are other dignified ways to live that are different, you don't absolutely have to be an employee at all costs.
Independent work, running a small business, those are other alternatives to live that are equally valid.
If he liked it that much, then probably he wouldn't have started a whole side project that must have consumed evenings and weekends for years.
If he would have found professional fulfillment in his job, he would not likely have started a side project in the first place.
As he mentions in his own reply, he stays because he feels that his job defines him as a person, and he would lose his social identity if he left.
This is a surprisingly lucid reply, he can do whatever he wants and I wish him the best, but it's clear to me that he has other much better options available.