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How Not To Get Banned
First, you need to set a HTTP_USER_AGENT for the tool you will be accessing ACDB from.
Using the wrong user agent will ban your IP for the day ( 402 Payment Required )
If you leave it with the default, you will be joining a pool of people who also left it default, and together may pose a DDoS threat. This is why I auto ban curl/python/wget any any other popular tool.
To safely check your user agent, visit this page: https://www.animecharactersdatabase.com/vars.php
Second, you need to rate limit your requests.
30 pages in 3 seconds will trigger a DoS ban. ( 429 Too Many Requests ) 100 pages in 100 seconds will trigger a day ban ( 503 Service Unavailable ) 3000 pages in day will trigger a day ban ( 503 Service Unavailable )