I see your point, however, let me push back just a bit. While I agree that gambling platforms need to be responsible, placing all blame squarely on them may not be entirely justifiable. Now, let's break this down logically:
Yes, the aspect of public vs. private is crucial here. It's awkward, as you say, to have a private act become a public spectacle. However, it's important to remember that these platforms are businesses. If there's a demand, they will supply. Sports betting, by its nature, attracts spectators. If that's paired with something explicit, it's only a consequence of that demand. It's less about "promoting pornography" and more about giving the audience what they want. Minors accessing these platforms is, indeed, a serious concern. Yet, we must remember, the responsibility to regulate such access lies not solely with the platform, but also with guardians and government bodies. Implementing effective age verification and parental controls is key. Lastly, stating that no gambling platform would promote this because it "purely promotes pornography" is a bit too sweeping. There are always outliers. Some businesses will push boundaries for profits. It's up to us, the consumers, and the regulators, to push back.
On point! Though I'm totally against this sex becoming a sport thing, I do agree with what you say about sportsbooks and gambling platforms, they wouldn't really care about the moral aspects of this but they will only see if they can benefit from it or not, if a large audience starts watching and liking the sport, I'm pretty sure that sportsbooks will start adding the matches up for gamblers to bet on because they would know if people would do it or not.
And talking about minors accessing sportsbooks and casinos, I think it's their elders' responsibility to keep them away from these things, and if they don't or can't, you can't really blame casinos for what they might see or experience because they won't shut down their business for people not taking care of their own responsibilities.