Castro hadn’t been updated for two years (with a single bug fix in between), then received 15 updates in 2023. Last one ends with "More exciting stuff coming soon".
Servers seem to be working again now…something’s going on, but it doesn’t feel like it’s dead or on life support (yet?).
I sincerely hope it’s not going away, I tried a few apps and the next best thing was Pocket Casts, but none of them click.