To be fair, the email they sent to their newsletter list is more succinct and clear about their services shutting down:

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This will be the last email you ever receive from Actual. You are receiving this because you are a subscriber or have used Actual in the past.

Actual is moving to an open-source model and will be 100% free.

This means our subscription syncing service will be shutting down in the future. We have instructions for setting up your own server, letting you completely own your data and have syncing for free.

Read more details about how this effects you in the full blog post: https://actualbudget.com/open-source