if that were not true, they wouldn't be in business.
Why? They are not loosing anything while developers are gaining time using their website.
They had 66 million dollars revenue in 2021. They have about 20 million registered users (and much more unregistered, and that's revenue not income, but let's forget that). Do you really, honestly feel, that SO doesn't save you $3 worth of time per year?
I use stackoverflow for minutes at a time and it almost never has answers to the questions I need answers to. if it has an answer, it's usually "you can't do that". reference docs are 100% of the time more helpful. so no, I don't think so.