I really like their listed user experience goals:

1. Cross-platform engagement

Create content via one platform and engage with users on other platforms.

2. Moderation choice

Voluntarily opt into moderation policies that reflect the experience you want.

3. Data portability

Data portability and credible exit are built in (you can take your data and followers with you).

4. Advertising disincentive

Portability prevents lock-in or captive audiences, which disincentivizes advertising.

5. Algorithmic choice

Users can choose the feeds and algorithms that work for them.

It's not do it yourself, it's more having more control if you want too.