I want to say, a lot of effort has been made recently to allow you to Self-Host Omnivore. I have done a lot to move it over so that all the features are self-hostable, including rewriting the entire PDF stack. I received a lot of support from the devs doing this too.

I know the decisions of the Dev team were disappointing, but it's also worth pointing out that the site was kept up until around last month - despite the warning stating that'd be down in November.

Omnivore could have shut down their code base, and prevented self-hosting entirely. I'm glad they didn't.