yes i have seen those before but for every one of these low fee spams there are so much more with higher fees.
and bitfury only finds 11% of the blocks nothing more. so that would be practically ineffective because other miners reject them.
c) the fuller the blocks are naturally, the less extra space there is , so cheaper to spam (this is why bigger blocks will help fight spam)
i find this statement contradictory.
cheaper to spam means easier to make more transactions.
and how much bigger blocks are we talking about!
1.2 MB 1.5 or 2 or 10 MB or 20
are nodes and miners really ready for that size. i don't think so.