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It will be impossible tell how much of an effect this change by Coinbase will have until we have a few weeks' data at a relatively stable price to compare to historical data, though.
Yeah, we won't be able to see the effect or to calculate the %, especially since right now the weekend has kicked in and the panic is over.(i hope!)
The only way I can think of is a comparison between outs/tx before and after, for a week period.
Or the average size (in bytes) of transactions per block.
A change from them should matter enough to be seen in graphics.
Too early to tell, but maybe???

Coinbase customers are obviously happy to pay their ridiculous fees otherwise they wouldn't be using them, so for all these years Coinbase have just been throwing away money and clogging up the mempool because they are too lazy to apply this very simple fix.
Look at the bright side, it helps to secure the network as miners received more fees, more income...
