As discussed in #2645 (comment), we currently bundle the Apache Ant tools because that was, bizarrely, the historical location that the tar archive utilities and bzip2 compressor were bundled. Now that they have a proper home in Apache Commons Compress, using the same implementations, we should migrate to those.
This should save us some size in our release distributions as well as being less confusing. It is also where all new updates will occur and easily gives us access to other compressors like 7zip.