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I did not read the link, but two of my biggest concerns do not appear in the summary you provided :
- the burden of hosting an ActivityPub enabled service is often duplicated for each instance instead of being split between them (for example, my Lemmy instance has a large picture folder and database because it is replicating all posts from communities I’m subscribed to)
- it’s a privacy nightmare. All instance admins now have as much spying power as the single centralized service it is replacing
(Edit: typo)
I can recommend some stuff I’ve been using myself :
I design, deploy and maintain such infrastructures for my own customers, so feel free to DM me with more details about your business if you need help with this