How do you know it's personal reasons.
there's no other reasonable reason for this being shut down
its pretty clear how steam doesn't cover what RTB does in terms of having a general, low-power irc, addons board, and easy-to-access friends list, so "because of steam" can be ruled out.
"because of the community" is dumb; why didn't he shut this down 5 years ago
"because of money" shouldn't be an issue; if ephi could maintain this for 5 years he almost certainly still has the money to maintain it for at least a couple years more, unless he lost his job (which would count as personal reasons). and in the case of money, he would have said so, rather than just say "nope i don't have any plan for this; cya guys"
anyways, definitely really sad this is going, since every time i've come back I've always used RTB to get updated on recent, useful mods and stuff. If ephi would consider continuing to host it with donations, that would be great, even without further development. sure, it may be old and "creaking," but it still works fine.