It seems plausible a significant fraction of ICs will choose to become GCs. Since matter and energy are likely to be instrumentally useful to most ICs, expanding to control as much volume as they can (thus becoming a GC) is likely to be desirable to many ICs with diverse aims.
Also, if an IC is a mixture of grabby and non-grabby elements, it will become a GC essentially immediately.
Also, if an IC is a mixture of grabby and non-grabby elements, it will become a GC essentially immediately.
+1
I think Hanson et al. mention something like this too