I worry more about Groups.io's business plan than Mark getting run over by a bus. Groups.io seems to me to be extraordinarily non-exploitative as free services go. I observe that even one-man shops with a solid business plan can often get through disasters like the incapacitation of the principal, but flakey businesses never last. I don't pretend to understand Mark's plan, nor am I criticizing it, it's his business. But I will say that signing up for the paid premium service will help Groups.io stay around more than anything else its users can do. Treat the free service as a free trial, not a free lunch.
Best, Marv
Marvin Waschke