As time passes, the more big cloud providers there are, and the more complex they individually get (more products).
Assuming the chance of an outage is actually static. If there is one (highly reliable and trusted) provider with five products one year, and three providers with ten products the next year, the chance of you seeing an outage has gone way up because of surface area.
Assuming the chance of an outage is actually static. If there is one (highly reliable and trusted) provider with five products one year, and three providers with ten products the next year, the chance of you seeing an outage has gone way up because of surface area.