We thank Martin Rees for discussions that led to a significant improvement in our interpretation of these results. We thank Christopher O'Dea for providing the data on the large-scale structure of 0108+388. We thank the reviewer of this paper for many helpful suggestions that have clarified several important aspects of this work. This research has made use of data from the MOJAVE database that is maintained by the MOJAVE team (Lister et al. 2018). The MOJAVE program is supported by NASA-Fermi grant 80NSSC19K1579. S.K. and K.T. acknowledge support from the European Research Council (ERC) under the European Unions Horizon 2020 research and innovation program under grant agreement No. 771282. K.T. acknowledges support from the Foundation of Research and Technology—Hellas Synergy Grants Program through project POLAR, jointly implemented by the Institute of Astrophysics and the Institute of Computer Science. A.S. acknowledges support from the NASA contract NAS8-03060 (Chandra X-ray Center). G.T. and E.S. acknowledge support from NSF Grant AST-1835400. N.G.'s research is supported by the Simons Foundation, the Chancellor Fellowship at UCSC, and the Vera Rubin Presidential Chair.

This paper depended on a very large amount of VLBI data, almost all of which was taken with the Very Long Baseline Array. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

In recognition of his many important contributions to astrophysics and cosmology, and in particular of his work on jetted AGN, this paper is dedicated to Mark Birkinshaw. Mark was working hard on this paper right up until his death from cancer on 2023 July 23. Mark is sorely missed worldwide by his colleagues and friends.