Actually, I’d easily pay $25 or even more for a similar app, for Fastmail.
I’m not sure Omni is as tied to quarterly planning/reporting; but for those who are, and are on the regular calendar schedule, this all happened just in time for a lot of the potential Q1 end of quarter sales to dry up as everyone tightened up.
I had a better / more elaborate explanation bookmarked somewhere but can't find it now, the tldr is a "modern" OS (past ~2-3 decades) wants the freedom to manage anonymous (malloc) and named (mmio) memory between physical RAM and disk devices. Disabling swap means the OS must always keep the anonymous pages in physical RAM, which negatively impacts any IO-bound workload (can't cache) and, ironically, puts more pressure on the disk.
So unless you have an extremely specific and finely tuned use-case with lots of benchmark data, the OS will almost always make a better call.