Even though I have a firefox account, I'm glad I have moved off Pocket (to Readwise Reader).
I don't want all my accounts joined. I don't want a threat model where being locked out of one service takes down everything, especially when that service has no support. This applies to gmail and Mozilla equally.
It will be $8 a month if you signup during the beta and pay yearly. Seems kinda steep if you're just using Pocket as a "read later" tool that scrapes the page.
Readwise is absolutely high end power user software, and not just a "read it later" service. If you need it's features, it's worth it. I really like all of my highlights syncing to my obsidian notes, the ability to use a single source for rss/epubs/webpages/pdf/etc and having an AI assistant to throw at tasks.
If you want a free, more direct pocket clone, check out wallabag: https://github.com/wallabag/wallabag