Hugh mistake by whoever started the protest to have an end date for it. Now only a fraction of the ~8000 subs that planned to go blackout indefinitely has remained private. The protest has achieved nothing and Reddit will continue doing its things. Not to disregard the efforts but this is definitely not the right way to protest.
A local password manager, eg KeePass, is easy to use. At most basic, think of it like a spreadsheet that you save with a password. Managers add a bunch of features on top of that basic concept.