I don't think it is sad. Attractive people are, by definition, attractive. They are nice to look at. This is not everything, but it isn't nothing. In the same way, some people have massive innate talent, or disposition, or intelligence. They can be fun to watch or listen to or just be around.

Perhaps it feels sad because much of attractiveness is "unearned". Some people are born more or less attractive than others and that is unfair - but I think most human attributes are like this. A smart person didn't earn their intelligence, and while they may feel they earned their knowledge, and perhaps they're right, they'd never have been able to earn their knowledge and intellectual accomplishments if they had been born mentally deficient. Famous basketball players work hard, but it wouldn't matter if they were born into 5'5" bodies, etc.

That some people are more attractive than others is unfair, but that fundamental unfairness shouldn't prevent us from appreciating attractive people in my view. I don't see anything wrong with promoting more attractive TikTok users provided it does actually result in a better user experience. In the same way I don't see anything wrong with selecting attractive people to be actors in your movie or film. If you want people to like the main character then it is probably smart to cast an attractive person.