Subscribing does nothing to promote their videos in the algorithm - therefore, subscribing has negligibly positive effects on the channel.

If you want to support a YouTuber, the absolute best way is as follows: Click on videos from the recommended feed, Like, and comment a quote from the “most replayed” section of the video.

YouTube doesn’t care about subscriptions - neither YouTube, nor the creator make money off number of subscribers.

If you want to not support a creator, but still watch the video - clicking on it from your subscription feed (NOT recommended) with an ad-blocker, then clicking through the video is the best way.