Don't know what the exact cause was/is for this big surge - but I am glad to see it. No matter what personal problems people may have with the main devs, they are doing great work on the platform.

https://join-lemmy.org/donate

https://liberapay.com/Lemmy

Also of interest, since this is a good place to plug things, other threadiverse things:

https://liberapay.com/PieFed/

And I couldn't find a way to donate to mbin, in lieu of that:

https://docs.joinmbin.org/contributing/

EDIT: The creator of mbin gave a link in the comments: https://melroy.org/donate.html