Kraken brokers apply fees.
It's not like you can run such things as exchange websites without needing to finance it.
Though indeed yes, it's really high. Doesn't seem to correlate with Kraken claimed fees schedule by the way, it's probably made to make people maintain their Bitcoins on their platform.
I have heard so many opinions about Kraken that I do not know what to think about it myself. How many people have so many opinions. What do you think about this? I'm curious because I've always had it as a good platform, and people say it's getting worse.
This fee probably will cover the mining fee (it is around $4 for fast transaction).
Probably that is why they have it fixed there, so they could get something for them too.
After all there is a service they provide and it needs funding, also if you keep funds there it's better for them.
This amount of fee will cover the variance of mining fee, as from time to time it is different.
When BTC was under $1000 this fee was the same (as it is the max mining fee it could be) and back then it was like $0.1 then everyone was happy....