A mining pool lets many participants work together on finding blocks and divides the rewards according to each contribution. The plural pools describes the landscape as a whole, inviting comparison, explanation and choice. The English word pool is common in German, used for vehicle pools, talent pools and data pools, so it reads naturally. The .de ending addresses miners in Germany, including hobby miners who run a handful of machines at home and want guidance written in German.
The name belongs to the mining category and the Bitcoin Mining DACH collection. Its plural suits informational and comparative projects as well as an operator brand. Typical uses include a German-language pool comparison with payout models explained, a dashboard that aggregates a miner's statistics across several pools, a community pool for DACH miners or a consultancy that advises on pool choice and the tax treatment of payouts.