Update - after more prodding both representative mentioned that you can actually move to monthly. It's just something that they can't (don't) want to enable. "Heroku online" exists but being aggressively hidden.
We needed the unique jobs feature, which only part of the enterprise plan.
And since (at that stage) our budget was low, the enterprise plan was too expensive.
I reached out to ask if we can do any other payment scheme, or at least get startup discount to start using, but were declined.
We ended up using an OSS library for that part and even now what we grown, still don't pay for sidekiq. If it was part of Pro, or we had a 1 year discount for startups, we prob just kept on paying even now (that we can afford it).
Can someone explain why this is better than just using pumps to pump water up from the reservoir and extract the energy with when the water returned back?