Perhaps. Here is the problem: those that Twitter casually typically do not target then add 150 followers from one person/group's list of followers. Now multiply that conspicuous activity by 500 other TA accounts doing the same thing from that same list of followers during a multithread cycle.
If Twitter does not presently have filters in place to detect that behavior, you can bet they will in the near future.
No? Look at Facebook. As many here know, followers of Facebook fan pages and groups were once easy to poach. Then restrictions were imposed on the number of network friends viewable to third parties. Restrictions have been further enhanced to restrict messaging and adding friends. In some instances, adding friends is restricted by affinity; that is, one can no longer randomly add strangers in volume. There must be a common friend or network affiliation.
@Erroronline - You have one, if not 'the,' best Twitter soft on the market. Just trying to be forward thinking in order to keep it that way.