What's up with AP carry supports?

Hey. So I've come back after a bit of a break and it seems to me that 50% of the supports I get with are playing mages you'd typically see in mid lane. What's up with that? They leave the farm for the ADC but take most of the kills and use the gold to build full AP carry, then expect the rest of the team to protect them while they glass cannon build themselves...

Am I wrong in thinking that a support should be a utility/tank style champ who is happy to go 0/10 if it means the rest of the team are 10/0? Or is support now the role for folk who can't manage waves and farm so they just sit bot doing nothing other than focusing entirely on the enemy champs and trying to get themselves fed rather than actually supporting the ADC and then the rest of the team?