They won't be downloading games all day long but I think alot of ISPs have limits on abusive subscribers that download like crazy anyway.
And depending on the limitation, i would classify it as predatory behavior. For example, there are few ISP which advertise their internet with claim unlimited usage but also do one of these, 1. Very strict data caps/FUP[1] before your speed is slowed down significantly. In my country, i've seen few ISP which offer 50 Mbps with only 300GB monthly FUP. Even comcast (one of ISP in USA) has 1.2TB limit and then offer actual unlimited plan[2]. 2. Threaten to terminate their service for customer who use lots of data[3]. 3. Attempt to throttle VPN and Torrent[5] connection.
The problem is: downloading blockchain data is not all what you have to do, to be a full node. You also have to verify that data. Verification time is much bigger bottleneck than blockchain size.
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Exactly. Based on one of LoyceV testing[6], you need fairly decent setup (4 core CPU, NVMe SSD and 16GB RAM, even though Bitcoin Core only configured to use ~6GB RAM) to fully sync pruned node in 22 hours.