Earlier quoted context omitted.
It's kind of a weird escalation -- steps 8->2 incrementally make sense (the more anonymized you are, the 'better'). But then the difference between step 2 and step 1 is totally different, the distinction is no longer anonymity, but some measure of efficacy of the support.
Maybe the axis is not anonymity per se but the dignity preserved by the recipient. Anonymity is not the goal, it's a means to an end. And providing employment achieves that end even better than anonymity does. In this light the lower levels also make sense, each progressive level allows the recipient to feel less guilty (the donor is not annoyed that they have to help, or doesn't even need to be asked, etc). The real…
My guess would be that when these levels developed, most giving was within a close knit community.