But whether or not these speeds would be meaningfully useful to you personally, the real observation here is just that GP is paying ~4.7x as much on a Megabit per second per month basis – your 20Mbps “I just stream” connection should cost hardly anything, a bad deal however you slice it.
(As an aside: yearly phone replacement?? I buy hardware to last on a much longer timeframe, so it more than balances out)
edit: back of the envelope network stat math – the 7.5TB I moved last month (up+down) would have completely saturated a 20Mbps connection for more than the month (34 consecutive days), assuming it was symmetrical (which a connection like that probably isn’t).