I wonder why people even do ddos attacks. What possible gain could there be from denying a service for a short while? Maybe competing webshops? It’s still seems overly childish to me. That said I never really looked into this.
2. Hurt your competition. In some online businesses DDoS attacks are used to compete with other businesses since if your competitor is offline more people will come to you.
3. Power. Some people want to flex the power they have over others.
4. Fame. You can get notoriety for taking something offline.
Dont like what a site is saying? DDOS so it cant load and people cant read it. For bonus points you are preventing site from getting clicks and thus ad revenue.
There are communities on discord that setup donation links to make sure sites they dont like keep getting hit by DDOS via crowdfunding.