If ICANN really chooses to break every GitHub Pages, crates.io, gcr.io, quay.io, etc. URL just to blindly follow a policy, then they will have proven themselves an incompetent arbiter of the domain name system. This feels so unlikely that I'm not worried about it all.
If it turned out to be a nothing-burger then I would use that .io for a blog page related to the community or something else non business or revenue critical and have links back to the new domain. I would keep the commercial content on the .com, the community forums on .net and philanthropic type content on .org or .io. i.e. news about donations to funding a new no-kill animal shelter and such
not that i agree, but obscure acronyms are a PITA