Re: Don't deposit funds to directly CEX from the third party.
I don't understand the language in the link you shared but I think it's related to Sinbad campaign managed by Royse and I was part of it that year. I think issue like like this has more to do with region regulation in compliance with government order. The truth remains we can barely do without centralized exchanges even though we despise them. The best practice of using Cex is the usual practice of depositing a small amount to use at a time and never deposit large amount of assets or store your assets in Cex. I find it offensive to freeze one's assets at any slight issues thou and more provocative to request for sources of funds.
Actually, there is not much to understand here, if you Google translate the post I mentioned the link to, you will understand it. Even so, for your convenience, I have quoted the screenshot of the English version of that mail below.
Anyway, I won't say that I don't use cex. Because I do myself use cex, but I use it more like a gateway. If the signature campaign payment also comes from Mixer, then I only use that cex as an exchange option, then I withdraw the funds from there and put them on another platform.