Disagree, this tool is meant for use by small instance servers, not large ones. Large ones have to manually handle their list since they are on the hook more for maintaining some kind of policy and announcement structure.) The only way it hurts them as a little guy is if they break the policies of a major instance enough to get blocked by the instance admins, which would take some work for a small instance. (The same or greater amount of effort that would get you banned if you lived on the major instance so no benefit to making it your home there.) And then they only get blocked by that instance and the other small instances using this tool who chose to sync from that major instance. They remain fine on other large instances and small instance that sync from those other large instances instead.

If a large instance does start squashing little people excessively then hopefully that hits the feed and people can pick a different instance to sync from.