Broadcastify feeds are usually provided by volunteers with scanners, although sometimes, an agency itself will provide the feed. If a volunteer moves out of the area, the feed will be taken down. Sometimes a volunteer feed provider will have equipment that fails and isn't replaced. Or the volunteer just loses interest in maintaining the feed for whatever reason. To avoid dependency on somebody else providing a feed, you could invest in your own scanner. One advantage to having your own scanner is that you could listen to more police channels than what a feed provider is allowed to stream.