Then, as an optimization, you change the text to “submit 100 times”, and now it’s you that posted 100 of those tweets. Also, a little timer field where you tell it how long to wait until it tweets it. Perfect.
If you have a genuine need to post something, waiting 5 seconds is not a big problem. But if your goal is to spam 1000 of something, now you need to wait 5 seconds between each post, and the task can be made progressively harder so that by item 1000 it's a 5 hour calculation rather than 5 seconds.