As a former cal.com advocate, I am now going to be switching my two companies to cal.diy or a similar alternative and canceling my cal.com subscriptions.
I am now actively rooting for cal.com to go out of business now as a cautionary tale for any company thinking about taking open source projects proprietary.
FOSS || GTFO
You might want to double-check the cal.diy maintainer before your wish is granted..
If you are looking for an alternative then please take a look at NeetoCal https://neeto.com/cal . It's closed source though.
Disclosure: I'm the CEO of NeetoCal.
Never heard of Neeto. It's a no-brainer (imo).
I perceive and classify your business model as a product optimization race-to-the-bottom model, if it makes sense. Have you considered or are currently working in the Field Service Management (NeetoService) space? Perhaps an ERP (NeetoERP)? Honestly curious because they're both sorely needed.
Thanks again for your AMA-ability. ;)