Some more details on Ocean's anti-spam: - the majority of blocks found by Ocean are mined using DATUM, where the miner can provide its own template, so Ocean's policy doesn't matter at all. It would be interesting to have some stats on how much of the Ocean DATUM blocks are anti-spam, I don't know, but my impression is that there are spam-filtered as well as non-filtered blocks there - for the non-DATUM blocks, i.e. when you as a miner simply use the block template provided by Ocean: even there there is choice for the miner. Probably many use the default setting (which filters a lot), but no-filter option is also available. They all have 2% fee. See

OCEAN

Alternate Templates

I'm very excited about Ocean, and about their growth! Their novel way of coinbase-payout, being PPLNS, and offering a relatively easy own-template solution are all important. I'm not sympathetic with their filtering stance (and I'm not using filtering), because I consider it ineffective (as long as there are even just a few % of miners who don't filter), but that's not the main point in this post.