What would you build with a pile of cheap x86 servers?

Reddit r/SaaS·low signal

A developer with access to a stack of older but usable x86 servers — high core counts, decent RAM and storage — asks what SaaS is worth building on owned hardware. The thread is an implicit read on whether self-hosted compute is economically viable again now that inference is the dominant cost line. Notable mainly as a signal that builders are re-examining the default cloud assumption.