You can't have everything! ^_^

More or less my thoughts too. With the release and bundling history of the game, I'm not sure I see what exactly the point of this infographic is.

No one claimed otherwise.
But promos and discounts happen, you know. And they are not synchronised between different stores, in other words, Steam and GOG do not always sell at the same price.

Are you saying that if Steam sells something with a normal list price, and GOG sells the same thing -75% off, the developer gets the same amount of income per unit from both?

I don't know how contracts like these are written, so guess it's possible, but I seriously doubt it.

And as different stores have different prices for same products at the same time, I also doubt that it's not the rightsholder who is behind all that - of course, they must have agreed on that one way or the other somewhere along the way.

That's a game I think I bought on GoG (almost ?) full price early on.
Gosh I feel special.

What are the 'other' distribution platforms mentioned in the first pie, it seems like there are a lot .

So how are they undercutting themselves if they set the prices? The only possible way is, maybe, some hapless rightsholder thinking, "oh, Fly By Night Bundles only sell like two copies a year, if we set a 90% permanent discount there no one will know". But no one actually does this. If they sell the game discounted on Steam but not on GOG and people google the price and decide to shop at Steam, rightsholders aren't suffering in the slightest.

I guess the reason is that it's just too inflexible to determine the future completely when selling a product. Surely the publisher gives some flexibility to the distributor to make promos when they see fit, if only to coordinate with other games promos (summer sale, ...), within limits of course.

It's not bad for the customers. This means that you can buy games during more days of the year for a discounted price.

For example, I use a price alert system like isthereanydeal.com and decide based on the price history, price, frequency of discounts, my personal opinion of the distributor where and when I buy a game.

My general strategy is: I prefer GOG or the publishers website directly but if another distributor offers the game much cheaper and GOG does not match that for a certain time period, I might buy somewhere else.

It's all a big game - the buying. However, I prefer to play the real games. I just want to make sure, I get a lot of bang for the buck and with isthereanydeal.com I can largely automatize the boring buying game. It's the solution to everything related to buying games.

That's valuable information, thanks! I did a bit of a double take when seeing that gog only accounted for 2% of sales.

Someone ought to take them to task for this in the comments section. Frankly, the graphic is making gog look bad and it may help persuade other indiedorkdevs to not bother with gog in the future. They released Samorost 3 (or whatever the thing is called) day 1 on gog, but I wouldn't be surprised if the numbers are even worse for that one, considering how badly Anamita screwed gog customers in the past (Day 1 pay what you want Humble release for Botanicula after it was a gog-exclusive, full-price preorder, Samorost 2 got a 90% off Humble deal literally the day after the full-price gog release). A lot of gog customers have become wary of Anamita and this misleading "info graphic" reinforces that.

According to [url=https://isthereanydeal.com/#/page:game/price?plain=machinarium]isthereanydeal.com[/url] those could include:
Windows Store
Amazon
Desura
GetGames
Adventure Shop
Nuuvem
GameFly
Direct2Drive

Under this aspect the 2% are looking eye popping impressive. When the game arrived here it already was a used up, sucked out of life haborwhore in retirement and gog still managed to successfully pimp it.

Whomever is responsible for that games/devs finance & distribution should consider a new job; that might have been a lot of revenue lost over the 1+ year it was practically gifted away at humble.