From personal experience, I've tried scraping my own TD Ameritrade data and quickly got flagged by their system as a virus because my request pattern likely failed some heuristic check. They disabled my account "until I get that cleaned up" and I had to plead with multiple people over the phone just to get it re-enabled.
The overall experience was quite terrible, but I wouldn't be surprised if it's the norm.
The overall experience was quite terrible, but I wouldn't be surprised if it's the norm.