[probst]

Recurring and steady incoming is certainly useful for any company, but I would advise against doing tiny monthly donations over a larger yearly one! Processing fees are going to take away a significant chunk of your total donation relatively speaking if your individual donations are small.

Let's do some math: In signal's case, since they use Donorbox, there is a 2.9% + 30¢ fee for credit card transactions going via Stripe (in addition to another percentage that goes to donor box). If you were to donate $24 once per year, Signal would end up with just over $23 after processing fees had been deducted. If you donated $2 per month, they would end up with $19.7 per year, an additional $3 being spent on fees!

Edit: unless they have some special lower cost stripe rate of course, in which case you can ignore my comment altogether ;)