ProofofBrain is a generic tag and can be used with any blogs and even they don't have an issue with that, I mean the people from POB community.
Even the Neoxian is a General purpose forum as per the description in their community.
Having said that, Creative coin is something which is not a general purpose one and I myself got couple of downvotes when I started my journey back in 2017, but I don't see there is a dedicated moderation being done now on that community, I think, as I am not using that tag anymore and not in a position to comment much on that.
So, no issues with those and even we all use the same as those are general communities without restricting blogs from any tribe.
Sports Talk Social is intended for Sports related blogs only and CINE community is for Cinema and TV Shows related blogging as for as I know.
Yes, we have been seeing others also using the tags related to Sports when there is no Sports content and we have been discussing on this and a cleanup activity will be taken up.
We want this community be more rewarding to the bloggers who are posting Sports related blogs and there are communities now for almost all the different categories like CINE, Photography, Skating, Food stuffs posting.. Don't you thing you will feel annoyed to see a Sports related blog on food related community if you are a mod for that community and doing curation, buddy?
When we create a community, the purpose is to let that community members share the blogs related to that particular community and enjoy themselves instead of seeing blogs related to other community, which we can call SPAM as that community is not for the SPAM from other communities.
No hard feelings my friend, we want everyone to enjoy here by posting blogs related to Sports only and get rewarded.
Have a good day and enjoy your Sunday.