For example, if I wear a signature of a gambling house, do I need to talk in terms of supporting them while I compose posts?
How about campaign managers' and campaign owners' stand on this?
You shouldn't have to be in the favour of the company/service you are promoting.
You can help in the growth by doing your job better than before or any other person and make their name to be renowned here but if you are going to support them when they are not in the right side then it is going to cause you some reputational issues.