Honestly it's the rare exchanges like this that make me wish I was on the dating scene in this era cuz damn that was not a thing in my day. But the rest of it sucks so much, no matter the era lol
Yeah this might be a green flag. Person is being upfront about their needs, they're trying to fuck. It's fine if that's not what you're looking for but if you are, it's fine (imo) to be completely upfront about it.
When 90% of the people you talk to are going to ignore or ghost you, you shouldn't put much effort into trying to impress someone who is, for all intent and purposes, a photo with a name.
I had good luck with a site called Taimi. Not sure if it's still around but it was much better for dating versus the hookup culture of Tinder. I met my partner there and we've been together for years.