In isolation, if you look at the bigger picture their email support does not seem to be to a high level and an explanation is needed about the 12% APR for anonymity mining therefore apart from these two issues there do not seem to be any complaints and that is a good sign.
You can check the multi-sig escrow address
[1] if there is activity in withdrawals, the mixer is fine and working, and there is a balance of about 10 bitcoins in it, so there are no problems.
Maybe it's better to turn off the "mining rewards" as an additional feature, at least until they implement it better and obviously, it's not set up well. This is not crucial for a mixer service it only unnecessarily casts doubt on the functionality of the whole mixing service.
If they stop giving mining rewards, then perhaps the Anonymity set will decrease, as there will be no reason to leave your coins in a central mixer that may run away with your money and you will not get a return through it. The number is currently 567 user deposits, and I remember that it was about 4xx about two months ago, so there is a good increase in the number of Contributors who trust Whirlwind and canceling this feature may be harmful to Mixer. I don't know if them goal was 1,000 or 10,000 deposits, but features like zero fees and ANONYMITY MINING CAMPAIGN are essential things for them at the moment.
Regarding the delay in replying, I alerted them to the necessity of having an active member (if they do not have time,) these things will not cost them much (less than 200 dollars per month) but their effect will be better.
In addition to that, hiring an active person here to answer frequently asked questions and send problems directly to them if they do not have time to keep this ANN updated. After all, the service is still new and the support team’s delay in responding is not an act of a service that wants to gain trust and needs trust.
[1]
https://blockchair.com/bitcoin/address/bc1qf8h5k6sash8007vpesymxkw2xsg5d0r3j4l5vmcrwpz2pqu66fjstzgd3r