At first I thought people here were being pretty unsympathetic to an early version of a beneficial program. I could see a company setting a 6-month timeline initially, so they can reevaluate the program and choose how to evolve their support for open source. I expected to see something along the lines of, "at the end of the 6 months we'll evaluate whether to continue your free plan." But no, they're quite explicit ab…
So put a reminder on your calendar to cancel. It's not hard. That shouldn't be a reason to pass this up.
Instead of potentially getting billed for some trial I forgot about, I would rather pay for a month, immediately cancel, and then repeat every month when I realize it's not working.
Besides helping me keep my expenses under control, it doubles as an evaluation of the company. If they make it difficult to cancel, or do not let me use the rest of my paid time, I know they are not a company I want to do business with.