Be a member of TPC of a low quality conference
I strongly suspect that these are fake conferences, ultimately designed to scam you, other researchers and/or grant agencies for money. Any voluntary association with such events is a sign that you are rather clueless as an academic, and should be avoided.

There, however, plenty of small, very specialized conferences with high acceptance rates. These serve more as meetings and get-togethers for their research community than as highly respected publication venues. Being asked to serve on the TPC here is essentially a statement by your community that you are a respected member of this community, and would be a nice addition to the CV of a recent graduate.