Its not a surprise if you research their price structure. Essentially they charge very small amounts every second or minute to accumulate through the month. It can sometimes be a difficult thing to calculate up front, but they aren't hiding anything from you. Its just not broken down by the month, and unfortunately its not all in one place..

Just bandwidth or leaked keys or badly configured services. AWS had always been good to me and waived obvious problems as a courtesy, although I use Vultr because it supports the features we need and has some easier ipv6 options worth using (prefix routing)