Surely if they release a new course their servers should be able to handle the extra work
You'd think so and it hardly looks like a massive extra burden.
On steam yesterday there was between 230 and 250 early evening/night (UK time). Today there were 231 at 5pm before it dropped steeply to be 121 at 6pm, back up to 211 at 7pm, 227 at 8pm. 224 at 9pm and 251 at 10pm.
It hardly seems like a massive increase to me and although it may be that many more play on the launcher it would seem likely any increase would be roughly proportionate.