Yes though initially it was contractually giving certain parts of its profit to children’s fund foundation which existed before TCI and was a charity. After his divorce though the contractual donation was apparently cancelled. The aims written for the foundation all look nice but some are vaguely termed and I don’t know to what effect were they able to (or try to) achieve it.

https://en.m.wikipedia.org/wiki/The_Children's_Investment_Fund_Foundation