Anything to worry about if you use mixers and not doing anything illegal?
Will any one come knocking on your door if you use mixers and not doing anything illegal?
Will posts like this be banned too after Jan?
Will using mixers be an expensive?
I think this depends on the nature of transactions and on the laws of the country that you are staying.
Generally, if your country has a specific prohibition against the use of mixers, then it is best for you to avoid using such even if you are not doing anything that is shady. If you violate this law, then you will have to suffer the punishment imposed on your country.
I do not think that posts related to mixers will be banned as there can be a comprehensive discussion about it with objective elements coming from all people.
The use of mixers is both a luxury and a necessity- some may want to use such service to avoid KYC and other related data; while others use it mainly for shady/dark deals. Though that may be the case, I do think that mixers will still remain expensive despite its ban on this forum.