Where are those giveaways coming from?

Indiegala challenges.

Humble Heal: Covid-19 Bundle

newest humble bundle - https://www.humblebundle.com/humble-heal-covid-19-bundle?hmb_source=&hmb_medium=product_tile&hmb_campaign=mosaic_section_1_layout_index_1_layout_type_threes_tile_index_1_c_brazilindiacharitybundle_bundle

Probably a leftover from HB June 2020 or July 2019.

Humble Covid19

https://www.steamgifts.com/discussion/LKcAy/humble-bundle-humble-heal-covid-19-bundle

Incredibly cheap on Fanatical
https://www.fanatical.com/en/game/death-to-spies-gold-store
Almost all time low.

Most likely from the Indiegala challenges

https://www.steamgifts.com/discussion/LKcAy/humble-bundle-humble-heal-covid-19-bundle

KOTOR games (and some other Star Wars games) are almost always in the Fanatical Mystery Bundle

Latest said bundle is here:
https://www.steamgifts.com/discussion/oJ1rO/fanatical-mystery-madness-bundle

https://www.steamgifts.com/discussion/oJ1rO/fanatical-mystery-madness-bundle
The third game probably is from Lootboy.

https://www.steamgifts.com/discussion/VXHKx/humble-bundle-humble-deckbuild-battle-bundle

https://www.steamgifts.com/discussion/rtVEQ/humble-bundle-april-2021-humble-choice-17

It's being given away for free on a Russian site. Not sure if it's safe to link here since I'm unsure if it's one of those sites that asks you to login via Steam or do something in order to get it. :c

The post just above I think was asking the same thing judging from the posts I see.

I'm not gonna link it either but 3 of the giveaways do mention where they got it from:
https://www.steamgifts.com/giveaway/VL5IK/monkey-vs-dino
https://www.steamgifts.com/giveaway/AuEbR/monkey-vs-dino
https://www.steamgifts.com/giveaway/3ny21/monkey-vs-dino

Just about all the giveways for this game have been from the 1 person ... so assuming they are the dev perhaps.

https://www.steamgifts.com/discussion/hQaQr/humble-bundle-humble-best-of-bandai-namco-bundle

https://www.steamgifts.com/discussion/rSWOI/lootboy-codes-for-coinsdiamonds/search?page=360#98aPcwf

It's from lootboy - https://www.steamgifts.com/discussion/rSWOI/lootboy-codes-for-coinsdiamonds/search?page=360#98aPcwf

It's from GrabTheGames' giveaway.

Was on steam sale, including the 4-Pack. About actual keys I don't know.

https://store.steampowered.com/app/523770/Of_Bird_and_Cage/ this one?
was in a groupees bundle from 2015

All same gifter, probably got some copies from dev.

Steelseries giveaways but all keys are given out.

Random drop from Indiegala Feudalife Challenge.