This looks like Binance, their current Bitcoin withdrawal fee is flat 0.0005BTC (previously "dynamic", based on the price of Bitcoin)
During the 2017 bubble, Bitcoin price was excessively higher than it was months ago so if the withdrawal fee is "dynamic", it will be lower, so that must be the reason why you've seen 5000satoshi withdrawal fee.
The fee was actually higher at the start of 2017
https://www.binance.com/en/support/announcement/115000722011After optimizing our processes, Binance has adjusted BTC withdraw fee from 0.002 to 0.0005 BTC. For details, please check Fee Structure on Binance.
I don't think that there is any exchange who despite the price going up at least 3 ties if we consider the ATH would have also increased the fees x10.
In one discussion on the subject, I think we concluded that centralized exchanges in this way actually want to demotivate users to withdraw their funds in addition to earnings - and given the growing awareness of users about the actual ownership of digital assets, I would not be surprised if the demotivation in the form of fees become even more pronounced in the future.
Or they want to promote their own tokens and chains, in Binance's case as the fee for their so-called pegged token is 0.000004, 125 times cheaper.