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Will I be able to continue to use it for free or not?
Sentinel Hub is a payable service with some free options (30-days trial, EO Browser).
You can also ask for ESA-sponsored account:
https://www.sentinel-hub.com/faq/it-possible-get-free-account-research-purposes
they asked for a EO-SSO ID, where do I get that? It’s weird though, I had the account for only 5days now and it’s already expired ?!