Yes.
Situps place a compressive load in excess of 3,000N through your lower back. 2,400N is the threshold above which US workplace safety rules say that you must use a trolley, etc, or they won't be held responsible.
So if you think that 100 situps a day for years is good for your back, try being a shelf-stacker for years but without using trolleys, do it all with bending over, see what happens.
You don't need situps. Every exercise can be, should be and is a "core" exercise. Do squats, etc with good posture and braced abs, and you will work your abs very well. The best abs on any male I ever saw in person were on an Olympic-style weightlifter, he never did a situp in his life, but front squats, high pulls etc worked his abs hard.