What changed

Prices, providers and infrastructure. Every recorded change, by day.

Incidents
Prices
Plans
Companies
Data centers
Networks
Incidents
Prices

Only recorded changes, never an inference. Prices are the provider's own list prices and a move is counted at 5% or more; incidents are what a provider published about itself. A plan seen for the first time is left out, because a baseline cannot be told apart from a new plan.