Is it possible to say that the web crawling using the package has also built a crawling system?

There must have been a condition, right? GetOldTweets3 is a Python library and independent tool…

It can be used as a library or as a tool.

In any case, when developing crawlers using Python, it is rarely developed without a library (package).

No matter how much you develop from the bottom, you should use a built-in package called urllib.

If it was a programming task, you would have to put a clue that the third-party (external) library is not to be used in the first place, or you would have to decide which libraries are available.