How many copies did My Free Zoo sell?

An estimated 25k to 41k copies, based on its 727 Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did My Free Zoo make?

My Free Zoo is free to play, so there is no copy-sales revenue to estimate.

How big is My Free Zoo?

Estimated owners: ≈ 25k–41k; from 727 reviews (Mixed)

A labeled estimate from the public review count (adjusted for release year), not exact sales. Owner data cross-checked with SteamSpy.

Does this actually work?

We left My Free Zoo out and predicted the genre from its 8 similar games. Every figure here, including My Free Zoo's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 11.9M–19.0M

best case 123.2M (PUBG: BATTLEGROUNDS)

The Multiplayer lane

A big, proven genre, though hit-driven: most sell around 14.8M copies, while a few break out far above.

A typical game

≈ 14.8M copies

≈ $204.8M after Steam's cut

from ~302k reviews

Best case

≈ 123.2M copies

PUBG: BATTLEGROUNDS

from 2.7M reviews

A breakout hit, far above a typical game.

6 of your 8 games sit in the typical range; 2 are breakout hits far above it.

Copies and revenue are rough lifetime estimates from the review count; typical figures are medians per column, so they can come from different games.

The lane you'd be entering

Winners here lead with Survival + Shooter, priced around $5.
The breakout hits carry Survival + Shooter + Battle Royale; a typical game here doesn't.
None of the games you compared shipped in the last two years; the newest is from 2019. That says more about your picks than about the market, so add newer similar games to read the timing.
A typical game here lands in Diamond ($1M+ before Steam's cut, est.). Tiers: Chris Zukowski's benchmark tiers.

Similar games

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VRChat 2017	Est. copies ≈ 9.1M–14.8M SteamSpy 20M–50M	Est. revenue Free	Free	265k reviews Mostly Positive	VRFree to Play +6
PUBG: BATTLEGROUNDS 2017	Est. copies ≈ 93.9M–152.6M 9.0x vs typical SteamSpy 100M–200M	Est. revenue Free	Free	2.7M reviews Mixed	SurvivalShooter +6
Hearts of Iron IV 2016	Est. copies ≈ 14.8M–24.1M SteamSpy 5M–10M	Est. revenue $204.0M–$548.6M net $371.0M–$844.0M gross	$49.99	371k reviews Very Positive	StrategyWorld War II +6
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Human Fall Flat 2016	Est. copies ≈ 9.0M–14.6M SteamSpy 10M–20M	Est. revenue $49.5M–$133.2M net $90.1M–$204.9M gross	$19.99	225k reviews Very Positive	Co-opFunny +6
Wallpaper Engine 2018	Est. copies ≈ 30.4M–49.4M 3.3x vs typical SteamSpy 20M–50M	Est. revenue $41.7M–$112.1M net $75.8M–$172.5M gross	$4.99	1000k reviews Overwhelmingly Positive	MatureUtilities +6
Cities: Skylines 2015	Est. copies ≈ 13.5M–21.9M SteamSpy 10M–20M	Est. revenue $111.0M–$298.5M net $201.9M–$459.3M gross	$29.99	290k reviews Very Positive	City BuilderSimulation +6
People Playground 2019	Est. copies ≈ 9.1M–14.7M SteamSpy 5M–10M	Est. revenue $24.9M–$66.9M net $45.2M–$102.9M gross	$9.99	314k reviews Overwhelmingly Positive	SandboxGore +6