I call it a DOS attack because blocks aren't regularly full anymore and the transaction data showed that the flood of transactions were "peeling chains", meaning they mostly had the same source. There is blockchain data to back this up.

The blocksize hasn't been increased yet. It blew over due to wallets improving their fee support. If you are in a hurry and need quick confirmations you increase your fee by 10 cents, but if the transaction doesn't need priority you may wait for quite a while.