Clearing a drain without looking at it first is guessing. It often works, which is why the habit persists — but it means nobody finds out why the drain clogged, and the same call comes back in four months.
The four things we usually find
Grease buildup, which hydro-jetting handles. Root intrusion, which needs cutting now and a plan later. A bellied section where the line has settled and holds water. Or a collapse, which is the only one that is genuinely expensive.
Why you should get the footage
Any company that finds a problem worth thousands of dollars should be willing to show it to you. Ask for the video file, not a description of it. If the answer is that they cannot send it, that is your answer.