Haha I’m glad you found it inspiring - I only ever intended for it to be a temporary exercise in overkill networks but I love squeezing ISPs for what they’re worth and I just kept getting lucky.
Beware that getting multi gig wan is a very good excuse to overkill your network with 10gig firewalls, switches, and the latest bleeding edge draft-standard-based wifi gear, on the plus side you will always have a retort when someone online says you could never need mgig home gear because surely your wan can’t be more than a gig anyway.
From the related post linked by op, it’s described as just a portion of the managed instance hosting fee going back to the project devs. So if you pay them to host a lemmy instance, a small cut goes to Lemmy devs. Doesn’t seem sketchy at all. Seems to have nothing to do with monetizing the instance itself, which could be funded by voluntary donations as normal or you could probably do membership fees as some instances do. It seems this is just about giving funding to the software devs. Hopefully this encourages other managed hosting providers to also give a cut of their revenue to the software they are using for their business.