Remember copyright was introduced to advance learning
No, not just for that. The founders understood that the society would be a much richer place if artists didn't lose their incentive (the ability to make a living if their work was compelling enough to draw a paying audience) to invest the time and effort (and materials, and hired talent, and a million other variables) in creating thing that it takes a lot of time to create. You're thinking of "photographers" as "service providers," but that's only a small sub-set of that sort of work. That's like saying that the guy walking around tables at a restaurant playing a violin for tips is the same as the first chair in a studio orchestra hard at work on a soundtrack project that it will take her and 100 other people two years to complete - long before the paying end customer (the movie fan) ever spends a dime.
Copyright protection allows people (sometimes by themselves, or sometimes including literally thousands of people) to gamble on the long term efforts required to produce more than an on-the-spot performance or hourly service.