Many Open source alternatives exist already such as vTiger and CiviCRM.

For my two cents worth I think they could do well by integrating with Nextcloud and Drupal or WordPress (Or whatever comes out of its current shambles).

From the article it seems like they are creating a extendible object model which in some ways is similar to what SharePoint has with its lists. Nextcloud has an add-on (Tables) that is a proto version of this. CiviCRM has worked to integrate website data collection from Drupal / Wordpress well.

Thinking from front of house (website) to back of house (CRM) then Nextcloud the missing link is to Nextcloud ( So documents and images can flow forward into the website Media Library ) and the extensible object model for data.amd being able to link unstructured data (documents etc. to structured data. (Not an expert on CiviCRM so not sure how flexible it is. )

But good on them for having a go. Let many flowers bloom. Even if it doesn’t take off some of their ideas might get adopted by someone else in some other way.

Also Cant see anything about acouch to 5K being open source either and its a NHS BBC collaboration . https://www.nhs.uk/live-well/exercise/get-running-with-couch-to-5k/

Is NHS weight loss app open source ( I mean its free and paid for by the National Health Service ij the UK so probably shoukd be ) https://www.nhs.uk/better-health/lose-weight/

Given that you can add Lemmy users in Mastodon / Friendica I think you can follow them from an account on any of those. Lets see as I follow my Lemmy account on friendica.