Things are definitely better then It was yesterday, I have a question though, If this is indeed a spam attack, anybody could do it? or this require money and resources to do? curious how It's done but If it require money, I believe big whales are behind it.
i am no expert but some things (i think) are obvious. for example the transactions need to be paying higher fees or they would be useless. so each paying 200-300 satoshi per byte. now multiply that by the number of transactions in the memory pool (60K-100K) or better multiply by how many of them are confirmed (which is more than that number) and you get the cost.
with that cost you can see who can or can not do it.
as other resources, this is obviously an automatic process. so some programming skills and a server is needed.