Can someone put this whole piece into plain English, e.g. we're going to fund less startups? or no more 150K for 7%, now it's 100K for 4% or something like that

Can someone put this whole piece into plain English, e.g. we're going to fund less startups? or no more 150K for 7%, now it's 100K for 4% or something like that in the first paragraph? I have no idea about "pro rata stake", or what "case-by-case" exactly different from what it has been doing.