What do u call a person who only notices you or talks to you because of something they want or need from you

People like this are usually referred as "blackholes" people who a person might give attention to but that person that you give attention to don't notice you unless they need you to do something for them.  

the animal shelter ad with animals in cages, starving and dying.

explanation:

there is 2 main differences, basically which are the users and the market. the other difference is the kind of content

people who use tik tok are mainly people from east asia, kind of like the app douyin. musically, on the other hand, are used by people from america or european countries.

while tik tok videos show things like daily life videos, comedy, or just funny videos, musically are like people mimicking songs with their own actions, 'imitate' singers and video clips.

hope this !