I went to donaldjtrump.com to donate to his legal defense fund.
Looks like most of the money doesn’t go towards the stated cause. Bait and switch. Directly from your link:
60% of each contribution first to Save America, up to $5,000/$5,000, then to DJTP’s Recount Account, up to a maximum of $2,800/$5,000.
40% of each contribution to the RNC’s Operating account, up to a maximum of $35,500/$15,000.
Any additional funds will go to the RNC for deposit in the RNC’s Legal Proceedings account or Headquarters account, up to a maximum of $213,000/$90,000.
I wouldn’t give a penny to anything that’s not very specifically earmarked for a narrowly targeted use. That goes for any giving to any cause.
Most often the money goes into slush funds for misc hangers-on to drain, they all belly up to the trough at feeding time.