"3. Fair Use Policy The Internet subscriptions for private customers are intended for normal personal use. Init7 reserves the right to temporarily or permanently restrict or discontinue the provision of services for connections whose data volume exceeds 0.5 petabyte (500 terabytes) in a period of 4 weeks, or to take another suitable measure."
(https://www.init7.net/de/kleingedrucktes/072021_contractual-...)
You can build some serious infrastructure on 500T/4weeks on a 25Gbps line, service uptime withstanding. They also provide optional /29 subnets with the private plan so it looks like it's intended for more than just personal browsing.