I wanted to make MMOs when I was like 12 years old and everyone on the internet told me it was impossible and it took millions of dollars and a team of 200 people and crazy levels of knowledge to even do the basics. Which, to be fair, was sort of correct at the time. However, it's fun to make not just one but now have 4 seperate MMO projects I've made huge amounts of progress on! And granted it's massively helped by reverse engineering original assets and reusing existing game designs - but conceptually it's entirely possible, and I've done as much for a project I haven't released much public info on yet. I'm also running 3 of them on a $15/month lightsail server - I put a huge emphasis on client-side work to make it as lightweight for the server as possible. This makes cheating easier but I'm not really worried about that since these are sort of glorified demos and not something I'd ever financially benefit from.