Testing Custom GB/GBC Link Cable Games on Nintendo Switch Online

Testing Game Boy and Game Boy Color injects to see if they link up, and not as many do as on GBA ( • Testing Custom GBA Lin... ) but the overwhelming majority work! Originally streamed on Twitch/Kick. Games tested:
00:00 Intro
01:43 Balloon Kid
02:44 Battle Arena Toshinden
04:25 Blades of Steel
05:46 Boggle Plus
08:41 Chacha-Maru Panic
10:19 Donkey Kong Country
12:06 Doraemon Kart
13:09 Double Dragon
14:40 Double Dragon 3
16:17 Double Dragon II
17:42 Downtown Nekketsu Koushinkyoku: Dokodemo Daiundoukai
19:01 Dr. Garfield
19:56 Dr. Mario DX (this only failed because it was a GBC rom with a .GB extension)
20:36 Dragon Ball Z: Legendary Super Warriors
21:39 F-1 Race
23:10 Faceball DX (same mistake as Dr. Mario DX, this worked later with the extension fixed)
25:40 FBG (Protoype)
27:42 Fist of the North Star: 10 Big Brawls for the King of the Universe
29:01 Fortified Zone
30:41 Gauntlet II
31:37 Heavyweight Championship Boxing
33:06 The Hunt for Red October
34:30 Ikari no Yousai 2 (Fortified Zone 2)
35:57 Into the Blue (Homebrew)
37:39 Jeep Jamboree
39:06 Jeopardy!
41:13 The King of Fighters '95
43:06 Kwirk
44:16 Lego Racers
45:52 Marble Madness (GBC version but only the GB version has multiplayer, whoops)
47:13 Mario Tennis
48:30 Metal Gear Solid: Ghost Babel
50:11 Mickey's Speedway USA
52:45 Micro Machines
54:14 Micro Machines 2: Turbo Tournament
55:30 Mole Mania
57:09 Nail'N Scale
58:36 Ninja Boy 2
1:00:38 Penguin Wars
1:01:55 Popeye 2
1:03:39 Power Quest
1:05:10 Radar Mission
1:07:33 Road Rash
1:09:33 Roadster
1:10:36 Rolan's Curse
1:12:11 Samurai Shodown
1:13:44 Sneaky Snakes
1:14:39 Spy vs. Spy
1:16:22 Street Fighter Alpha (doesn't have multiplayer)
1:18:11 Super Chase H.Q.
1:19:38 Super Mario Bros. Deluxe
1:21:30 Super R.C. Pro-AM
1:22:37 Suzuki Alstare Extreme Racing
1:24:32 Titus the Fox
1:25:26 Titus the Fox (GBC)
1:26:59 Top Gear Pocket
1:28:33 Top Gear Pocket 2
1:30:16 Trax
1:31:13 Ultima: Runes of Virtue
1:33:30 Ultima: Runes of Virtue 2
1:34:15 UNO 2
1:37:24 Vigilante 8
1:39:45 Wario Blast (no multiplayer, Super Game Boy only)
1:41:06 Warlocked
1:42:16 Wave Race
1:43:51 Woody Woodpecker Racing
1:45:37 INTERMISSION
2:04:04 Wordtris
2:06:01 WWF Superstars
2:07:15 WWF Superstars 2
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Is this legal?