You are right, Twitter follower lists do have bots and irrelevant contacts. There are 2 ways to remove/reduce this -
Since we provide verified email addresses, so that removes a lot of bots and junk profiles.
We can share the Twitter follower list (of the accounts you specify for Smart Lead List) with you, and you can remove/filter out the records for which you do not want full profile and work email. And then, we will get data for the rest of the records.