Datadog is one of the worst offenders in this one. It's like they actually want to get you into that situation. Wanna see your prepaid capacity? Lol, email our support. Wanna use front-end monitoring? Here's an example with the defaults hidden. (Oh btw the defaults enable all the features and set the sampling to 100%) How do I turn on sampling? Don't worry, limitless tracing is the way, we'll figure out how to filter your traces. (Oh btw you'll still pay for ingestion, we're just omitting it here)
I ended up swallowing the bill but will not be using them again since this is plain scary.
Edit: funny thing - to add insult to injury, I've started to hear from their sales people on "my growth plans", even though I've had a support ticket hoping to resolve this to no avail.