Singularity Hub used to publish all their content under Creative Commons and that had even earned them a place in the Creative Commons Wiki.
Today I checked up on the website only to see that they changed their articles license to a propitiatory one. https://singularityhub.com/
How to guarantee that when I choose a website that publish articles under Creative Commons, that they will not change their license?
If you want to publish, please do 2 things - find a publisher which does not necessitate exclusivity (as in, you do not necessarily have to just publish something on there portal) - and secondly, make a portal of your own, and publich a duplicate copy there. This serves 2 purposes, if someone really wants to follow your work, they can just follow your website, and in case a future bait and switch happens, you have a backup of all your work.