1. Beneficiaries are charities: funds from foundations are usually used to support charities, such as education, medical care and poverty alleviation. Painless reimbursement can help beneficiaries reduce their burden and improve their quality of life.

2. Promote the development of public welfare undertakings: the funds of the Foundation can be directly used for public welfare projects, such as donating schools and purchasing hospital equipment. Painless reimbursement can reduce the economic pressure of project implementation and promote the development of public welfare undertakings.

3. Increase the motivation of donation: For charitable donors, painless reimbursement can be used as an incentive to encourage more people to participate in charitable donations. Through painless reimbursement, donors do not need to bear additional tax burden, which can improve their enthusiasm for participating in public welfare undertakings.

4. Policy support: The government usually supports foundations with some preferential tax policies, such as tax exemption or tax reduction. The implementation of these policies can promote the foundation to play a better charitable role, and painless reimbursement is also one of the policy measures.

Please note that the specific reasons for painless reimbursement may vary according to the specific conditions of different countries or regions, foundations and different policies and regulations. What is said here is the general reason.