Well I see we're giving preview cards to anyone now. I enjoy Arin and the Game Grumps, but it seems odd to give him these amazing preview cards when for the most part he only opens packs and has had three or four Magic related videos. I feel there are other Magic personalities that deserve these far more than he does, by miles.
As for the cards they are very good. I almost enjoy the mana rock creation more than the free cast from Svella, but that's me, and a scry 5/draw 3 is amazing at instant.
This is the preview season where Wizards is giving cards to metal musicians, bands, and websites as a 1-2-of, and they'll probably never preview any MTG cards ever again. I think we're fine.
While true I can't say I find unboxing videos to be all that fun. At the very least The Professor makes it somewhat interesting with the booster box game and can give you some indication if buying a box can be worth it rather than the usual "watch me open 6 cases. OMGosh I opened 40 mythics and you can too" kind of thing.
Tbh unboxing channels often have more subscribers than gameplay channels. It struck me when I noticed Alpha Investments had way more subscribers than Mtggoldfish.
I like Arin, he's a very enthusiastic guy and I watch GameGrumps from time to time. I subscribed to his channel for a few weeks but when I understood he wouldn't play at all, just crack thousands of dollars worth of card every week, I unsuscribed. But I understand why he got a few spoilers, he's litterally promoting the whale's way of life x)
He has plans of doing gameplay on the channel, but he's iffy on Spelltable and much prefers in person, so it's on the backburner atm