No one is blaming anyone, but it is strange for a manager to pretend that nothing happened on the bitcoin network and send the same fees as before. Nevertheless, such moments must be taken into account when forming payments to their participants. Indeed, the campaign lasts 174 weeks and pays weekly $2.5k-$3k to its members, but can't pay the $25 commission instead of $5. It's really weird.
The reason is not necessarily to save fees costs, but rather a use of a bad Software in estimating the fees or there is no option to edit fees. I remember in the past that their wallet did not support bc1 while most wallets was supporting those addresses.
It is not limited to this service, but rather a lot of services and even some exchanges do not update their programs annually and therefore there is no choice to edit fees.
you can read more here
Why do some people pay illogically high fees for transactions?
This is also happen here
So it is not
really weird. 
@Best_Change please use is code
[1] before sending to avoid such discussions in the future.
[1]
https://bitcoindata.science/api/bitcoinfees.php