Looking at their price sheet, and converting Euro to U.S. Dollar, it appears that their "$5 droplet" currently costs $4.05. You'd have to make sure you pay with a credit card that doesn't charge foreign transaction fees, and you'd have to hope that the currency exchange rate doesn't shift in a less favorable direction later.
If you're a company operating larger VM's or larger numbers of VM's, then maybe? I guess. But if you're a self-propelled company or an investor-funded startup, then you're probably on AWS, Azure, or GCP anyway. And for personal side project use in the U.S., I'm just not seeing any real reason to jump for a 95 cent discount that will fluctuate.
EDIT: A thank you to the people who actually answered the question, or gave their own personal experience, rather than just downvoting. Looking more closely at the price sheet, I can see that while the smallest option is not very distinguishable from DO or Linode, Hetzner does get more competitive at larger VM sizes.