Oath.vote supposedly does not sell information but it's a shame they don't get nearly as much attention as ActBlue.

Perhaps it's time for people to start mailing cash and checks to campaigns instead of using online portals. The campaigns only need your name, employer info, and a valid mailing address and often provide forms on their site for this purpose.

Maybe after campaigns see that they're spending a bit more time opening physical mail from small donors they'll reconsider their strategy.