I, oddly, see a different pricing structure on that page. Full-time development Standard €55.10. This is assuming 100 active hours. "Active" being defined as "a user is connected […] via the browser-based editor". If I log in at 9AM and log out at 5PM every day for an average of 20 working days each month, I'd probably run ~€90 a month on the standard instance (and considerably more on the Premium instance). My current laptop cost around €1, 200 and I can easily provision a new one at any time using an Ansible playbook[1].
I am most definitely not the target audience of VS Online, which is perfectly fine. Someone out there needs this for it to have been built by MS.