What's the maximum number of beams? 8 beams at 3.5GHz is a very low capacity satellite, especially given that they likely cannot use all 3.5GHz everywhere.
My impression is that this is more of a tech demonstration satellite (to test the new payload, resource management software, etc) rather than an actual commercial satellite, as the total throughput seems to be much lower than state-of-the-art spacecraft from other companies.
[1] https://spacenews.com/eutelsat-adding-two-more-quantum-satel...
I think this was answered by your link: "Quantum was made possible by the British government, which is funding 90 percent of ESA’s commitment of 71 million euros in the Quantum program"
It's the government wasting a tremendous amount of money.