PayPal, gift cards and all of those things are deeply concerning. If the money is going directly to a campaign, they can't accept more than a small amount of money without disclosing the source of it, and they're not allowed to accept anonymous contributions above a very small amount of money. However, once you get into the outside spending groups—super PACs and groups like that—they can accept money from corporations, which by definition are a shield against knowing who is really behind them.
On May 28th, 2019. See this statement in context.