What do you mean by both mempools?
Mempool.space and Johoe's mempools, those are the two that I check and both had the same drop.
Nodes may drop a transaction from their mempool due to reaching their maximum size limit, but it's not that they will put that transaction again in their mempool, whenever they have space for that. Take note that each node broadcasts and relay every transaction to other nodes only one time, unless someone rebroadcasts the transaction.
I doubt that less of a quarter transactions that have stayed that long in the mempool since we had the ordinal spam have not been rebroadcasted over and over.
This thing for example is nearly 3 months old:
https://mempool.space/tx/2c36ea57aeced9e662a04d12ca7a184fd0af56704808bc5473ef40c43baaef72The way that the transaction is represented on the graph can be quite confusing. Johoe's mempool likely didn't drop the transactions and if it did, you'll see the proportion of 1sat/byte transactions decreasing faster than the rest. Remember that the minimum relay fee basically means evicting transactions below a certain fee rate threshold which is not what we are observing here. Hence, the expected behavior for this would be having the 1sat transactions dipping while the rest are largely consistent.
Yes but looking at Joe's mempool
At the start of the day there were 185Mvb with 155Mvb over 1sat and 99Mvb over 2sat/vb
After the drop at 12PM, 130Mvb , 101Mvb over 1+ 82Mvb over 2sat/vb
As we speak we have 140Mvb with 109 and 92 over 1 and 2sat/vb
So in 10 full days we had just 20 blocks worth of low fee transactions added although obviously there is space in the mempool to keep them and this including rebroadcasted tx?