Define old binary. The a.out and elf format haven’t changed in a very long time. If you mean something from an old system with unmet dependencies, it will run, but it will crash and warn you that some library isn’t found. It will still run up until that point tho.
I mean, there is nothing stopping you from installing whatever version of the library that is required in tandem with the latest version. You could even put it somewhere other then a standard library location and start executing your binary with
and have it dynamically loaded at runtime.
The only time this doesn’t work is when it is something in the kernel that breaks the binary… But you can run an older kernel that has back ported fixed.
I get where you are coming from with proprietary binarys that the devs have abandon. But to me that makes all the more reason not to run that software in the first place.
Edit: also the kobo desktop Windows app runs under wine I think…