Aside from what other member said, they also claim 30 second block time which raise concern about stale or orphan block.
That would be the last concern, I mean common, it's 2024, and I'm getting 300Mbps upload on my laptop 
The concern is more than internet bandwidth. There are other things such as,
1. Higher chance multiple miner mine block at nearly same time.
2. Time to verify and propagate the block to whole network, which affected by CPU speed and internet latency (not bandwidth).
But i definitely agree it's last or lower concern.
Doge has been doing 1 minute blocks for a decade and the chain had no hiccups, doubling the capacity with the tech advance from 2013 is nothing, this is just small blocks talk, swear to god, we will reach Pluto and video stream live 256k from our colony there and blocks would still be a "problem".
My rough calculation (excluding Fractal merge mining) shows it's about 7.5%.
Fractal: $28 x 25 FB * 20 (total blocks mined in 10 minutes) = $14000
Bitcoin: $60000 x 3.125 BTC = $187500
Ratio: $14000 / $187500 = 0.0746... (or about 7.46%)
I don't even know what kind of math I was doing there but I think I went totally wrong on it, two days ago this thing was having almost the same fees as in reward,
Total fees 21.38293474 FB $579.62 Miner SpiderPool
but I think I multiplied something else wrong.
Still quite funny, this is their hashrate (I assume)
Permissionless Mining 29.246EH/s, so still ~4%?
Nevermind, I got the split reward wrong!