It seems most of the entities being discussed in this thread fall more under the umbrella of modern, non-traditional media outlets than "influencers." The Fried Egg, for example, is far beyond influencer -- they produce a steady stream of professional written, audio and video content about golf, focusing on its architecture and history. Just because an entity has a strong social media presence doesn't classify it merely as an influencer. You can probably make the case that the success and the following of these outlets has paved the way for the success of the influencers.
I'm not sure of the textbook definition, or if one even exists, but I think the classic "influencer" is someone or some group that influences others simply by using a product. (Anyone in this forum with young children and a YouTube Kids account knows how powerful and quite frankly bizarre the influencer effect can be.) As far as golf goes, the top-tier influencer bounces around from course to club, foreign and domestic, public and private, taking pics, tagging sponsors, and not producing much else that is meant for repeat consumption or reflection. The mid- to low-tier influencer does the same on a smaller scale in a more defined area or genre. Some of them have a legitimate interest in the course and that day's round of golf; some are interested in being goofballs. If I'm wrong on any of that, feel free to correct me.
All in all, I think the influencer effect on golf has been more positive than negative. A good portion of it is obnoxious and self-serving, but overall I think it's been a benefit. At least here on a local level, 15 years ago half the courses on Long Island barely had a functioning website. Five years ago the majority barely had functioning social media accounts and lacked even the most rudimentary understanding of how to promote themselves to the local golfing community. The influencer effect has forced them to sort of get on board and get with the times faster than I could have imagined 2-3 years ago. The pandemic played a part in that as well.