~snip~
The 20% is used as a reference and depends on how much is in the wallet. There are instances it could be different from what I saw in one of their publication. The fee is fair to me and I'm sure anyone with no hope of getting his money from the wallet will happily pay 20% of the amount instead of losing everything unless the person is greedy which is not good.
20% is actually among the fee charge rate, which was why I talked about it earlier in one of my comments above. But as long as someone has seen an opportunity to get their money out from where it has been hanging, 20% off the amount is even too small to start thinking about if the fee is high or not.
All that will matter most at that time is first trusting the service provider if they can actually take their percentage and return the rest to the owner. If the trust and reputation are there, then it’s an easy decision.