the network fees what block chain use to charge before and now has a drastic change.
The network isn't setting the price of fees, it's users are.
This is either the result of people using badly written fee estimator websites, or bad wallet software estimates, or even just users blindly picking a fee without knowing or caring how low fees are (people are still choosing 200 satoshis/byte and even 1000 satoshis/byte in the last week, when they could've paid from 10-50 various points throughout the week and gotten the same speed of confirmation)
https://jochen-hoenicke.de/queue is the best website to use, the other popular websites are misleading or poorly laid out.
Another reason is that some online services/exchanges are poorly coded as well. E.g. some major
exchanges don´t even batch transactions and use the same fee irrespective of changes
in the mempool size.
It is unbelievable how some businesses that have a trading volume in the billions are getting
away with stuff like this, which perpetuates the fee problem unnecessarily.
If I were running a business like Coinbase I´d use a period of low fees to consolidate
inputs that are otherwise unspendable in an effort to increase the bottom line of my business
as well as the overall health of the Bitcoin network.