I've been using it for about 3 years now (the large ARM instance a bit less than that, but since about when it was introduced). There have been two outages about a minute each (seems like a no-no-downtime host migration, but I am not sure). For the cost, I am not complaining.
Have tried this out, and yes actually using it in any capacity risks an account ban with no recourse.
Easy come, easy go. (I was running an IPFS node, which at the time was CPU and bandwidth expensive)