cpf top ups

Changes of CPF rules for top ups

Why would people want to put in money into CPF for top ups of relatives when they could simply put the money aside or into their savings account? For the 2.5% or 4% interest?

Is that good enough to put give up good money which one has full control and put into a fund that one loses complete control over the money? Once the money is in the CPF, CPF is in full