More from @dcseifert here.

Happy day! Looks like Pocket integration may continue on. (But Readwise, you should totally still explore integration for Reader.) From an updated version of that @dcseifert article:

It looks like Kobo readers might not lose Pocket integration after all. Mozilla, the maker of Firefox and current owner of Pocket, originally said in a support document that Kobo’s Pocket integration would stop working entirely after August 15th, 2023, when Pocket will require Firefox accounts to log in. In a statement to The Verge (coinciding with an update to that support document) Mozilla now says that existing users of the integration will not be affected, and that Kobo would update their devices to use the new logins.