I’ve swiped on some former students (above 18). Granted they were former and not current students and it was purely for the humor and catching up. Never made any advances towards them. Typically just said stuff like, “Hope you have better luck on here than me”, “So this is why you didn’t study enough in my class?”, or “I have dreamed of cumming on those prime tiddies for years, let me poke your asshole with my 2 inch rod.”