> And as the community engineered solutions to reduce costs of transacting on the base layer, it has become cheaper for spam to be sent.

I would say that the reason it is cheaper to send transactions is that fewer people are sending transactions. 

Because bitcoin's fee market is dynamic, so "spam" protection works if things other than spam are bidding for inclusion in blocks. 

I'm hopeful more people will use Bitcoin, but at the moment there's not much competition to get into blocks.

Scoresby

Random thought popping in my head as I read through 

An ironic aspect about the mission of filterers is that PoW was invented as better mechanism than filtering to fight email spam by attaching a financial cost to sending spam.

And as the community engineered solutions to reduce costs of transacting on the base layer, it has become cheaper for spam to be sent.

Et voila! Filtering is back on the menu to solve a problem it never managed to solve without centralization before.

Stacker Saloon

saloon

Random thought popping in my head as I read through @Scoresby 's utreexo post (https://stacker.news/items/1464471):

An ironic aspect about the mission of filterers is that PoW was invented as better mechanism than filtering to fight email spam by attaching a financial cost to sending spam.
And as the community engineered solutions to reduce costs of transacting on the base layer, it has become cheaper for spam to be sent. 

Et voila! Filtering is back on the menu to solve a problem it never managed to solve without centralization before.