It’s a failure because when a whole bunch of Trump minions leave for an alternative, it’s harder to gather and consolidate the collected personal data they wish to sell. Much easier if everyone is dependent on one platform.
On an unrelated topic: it is relatively easy to host your own ActivityPub service (Mastodon being the most popular, but there’s also Pleroma and others). For Mastodon, all you need is a domain name, a server, and the time to install nginx + postgres + a typical ruby webapp. Hey @orenwolf, if you’re bored…