For this particular usecase, I am not super bullish because:

1. micro payments (ecash, lightning) allow services to monetize directly. This was not possible before due to a technical limitation, so businesses got creative and explored a whole bunch of indirect monetization avenues.

2. even for public and free services, something simpler like running pagerank-ish algos (pagerank, personalized pagerank, trustrank...) on the follow graph/zap graph would do the job.

Btw I am actually building 2.

There is defo a place for "proof of rich" in identity. For example giving a free luxury service only to rich people. E.g. try this yacht for free!

Everyone would enjoy a free day on the see, so the business must filter.