hi @crokkon,
The notifications, SBD giveaways, etc. DO NOT appear in the "spam" category but in the category that I have called REMAIN (after filtering out the other components) that represents only 5.83% of the transfers of 0.001 SBD/STEEM

In the SPAM category there are all those that clearly are unsolicited direct messages and try to convince the receiver in a more or less direct way to send some amount of SBD/STEEM.

The peaks of increase in the number of transfers of 0.001 SBD/STEEM do not coincide exactly with the waves of new accounts. Although they must be related, there is at least a temporary delay. I believe that this is due to the fact that Spam is aimed especially at new accounts but take at least a few weeks a user to start to investigate the possibility of obtaining profits through the use of bots, and the "memo Spammers" probably knows this.

And, of course, my prediction about the next wave of milli-transfers is a daring in this uncertain world that should be taken as a hypothesis.