It’s not super complicated, but you are unlikely to figure it out without a couple internet searches. You have to setup the router, which isn’t that difficult, and then wait to get connections. the torrent client is built into the router software, but you have to find the right I2P sites to get torrents because, as far as I know, only torrents inside the I2P network are usable. Each of these is pretty minor on its own, but adds up to a difficult experience for the average, non-enthusiast computer user.
So, this question comes from someone with no background in development or marketing but, wouldn’t this money be better spent on develoment or marketing of Firefox. I’m a little more worried about having a long term alternative to Chrome based browsers than self hosting photos. This is not a knock on Ente or any other photo hosting script, I am very interested in a fully functional self hosted Google photos alternative, but my priorities start with Firefox.