for People who use scrapers a lot, what are the most common pain points?

recently i was checking out the scraper services and it seemed like easy to build at first but when i thought about scaling it, that's when it got really difficult.

still i wanted to know the opinions of the people who use the scraper services and what services do they use commonly in general and their pain point, that way i will just focus on those points and try to build the first iterations.

really appreciate your thoughts on this matter.