some use the small amount as a spam filter, (the maxis don’t like this term but it’s essentially ‘proof of sats’) then limit their reading of the “global” or “universe” feeds to just paid read. By paying for write access you show up in these feeds. But most of these relays allow free read access.
Discussion
I guess I can see why they don't like 'proof of sats.'
For one it exposes the privilege of the non-poors, but more importantly it reveals an alternative approach which wouldn't pay relays (which doesn't help scale): that approach being to just check a users balance for a threshold of sats and ignore any below it - this effectively multiplies the cost of Sybilling accounts by threshold amount.