That's half true. The intent is to support children in poverty. There is an encouragement to engage in family planning. But no one wants the government to forcefully tie them down to a gurney and get the left gonad removed.
Certainly, there are things the system does to lock in recipients. The reforms passed when Clinton was president with republican support has done a lot to reduce long termers. Life time limits have worked well in that regard.
One of the things that really works in getting people of the dole is an aggressive program to train people in getting job finding skills. I am not talking trade or college education. But how to dress, how to write a resume, how to present yourself. Sign up before you see the financial worker. Doesn't matter how many kids you have at home. Show up everyday at the job center for four hours until you get a job. If I had it my way i'd make it 8 hrs.
In Detroit's case, the only thing that seems to have any effect is a aggressive law enforcement. But that ping- pongs back and force as people raise hob about taxes an budgets.
In the 60's Johaness Spreen, Chief of Police, put out a team of officers disguised as drunks, women and old ladies. When these guys were jumped the officer and his backup attempted to make an arrest. Enough of the criminals fled the officers and were shot. The crime rate plummeted during the program. Then a 14 year old kid was shot in the back one night. The courts ordered a halt to the program.