The only recommendation to everyone: move away or duplicate.
One of the strategies I am yet to test is the synchronization between gitlab and github for protected branches and tags and relying on their container registries. Thus (at least) you provide multiple ways to serve public images for free and with relatively low hassle.
And then for open source projects’ maintainers: provide a one command way to reproducibly build images from scratch to serve them from wherever users want. In production I don’t want to depend on public registries at all and if anything I must be able to build images on my own and expect them to be the same as their publicly built counterparts. Mirroring images is the primary way, reproducing is the fallback option and also helps to verify the integrity.