Looks like it's time for me to plug my fediverser [0] project. It can help people migrate away from Reddit by letting people sign up to a Lemmy instance [1] with their Reddit credentials and automatically subscribe them to the corresponding Lemmy alternative. The alternatives are crowdsourced. There is a "flagship" deployment at https://fediverser.network but if you want to fork it, you just need to run your instance and manage it as you see fit.
The project got a (small) grant from NLNet a couple of months ago for me to work on having the functionality built-in into the Voyager client (a PWA Apollo clone). If more people or companies would like to help/support, hit me up.