How many copies did CUPID - A free to play Visual Novel sell?

An estimated 52k to 85k copies, based on its 1k Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did CUPID - A free to play Visual Novel make?

CUPID - A free to play Visual Novel is free to play, so there is no copy-sales revenue to estimate.

How big is CUPID - A free to play Visual Novel?

Estimated owners: ≈ 52k–85k; from 1k reviews (Very Positive)

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 CUPID - A free to play Visual Novel out and predicted the genre from its 8 similar games. Every figure here, including CUPID - A free to play Visual Novel's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 1.4M–3.6M

best case 10.1M (Doki Doki Literature Club!)

The Anime lane

A big, proven genre: most sell around 2.2M copies.

A typical game

≈ 2.2M copies

≈ $7.4M after Steam's cut

from ~43k reviews

Best case

≈ 10.1M copies

Doki Doki Literature Club!

from 223k reviews

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 Psychological Horror + Visual Novel, priced around $10.
None of the games you compared shipped in the last two years; the newest is from 2020. 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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Helltaker 2020	Est. copies ≈ 3.4M–5.5M 3.0x vs typical SteamSpy 2M–5M	Est. revenue Free	Free	128k reviews Overwhelmingly Positive	Free to PlayCute +6
Mirror 2018	Est. copies ≈ 2.6M–4.2M 2.0x vs typical SteamSpy 2M–5M	Est. revenue $1.4M–$3.8M net $2.5M–$5.8M gross	$1.99	84k reviews Overwhelmingly Positive	Sexual ContentNudity +6
NEKOPARA Vol. 0 2015	Est. copies ≈ 824k–1.3M SteamSpy 500k–1M	Est. revenue $678k–$1.8M net $1.2M–$2.8M gross	$2.99	18k reviews Very Positive	AnimeNudity +6
UNO 2017	Est. copies ≈ 1.9M–3.0M SteamSpy 2M–5M	Est. revenue $5.1M–$13.7M net $9.3M–$21.1M gross	$9.99	54k reviews Mostly Positive	Card GameMultiplayer +6
HuniePop 2015	Est. copies ≈ 1.5M–2.4M SteamSpy 1M–2M	Est. revenue $4.0M–$10.8M net $7.3M–$16.7M gross	$9.99	32k reviews Overwhelmingly Positive	NudityMature +6
Crush Crush 2016	Est. copies ≈ 1.1M–1.8M SteamSpy 1M–2M	Est. revenue Free	Free	28k reviews Very Positive	Sexual ContentNudity +6
Tales of Berseria™ 2017	Est. copies ≈ 649k–1.1M SteamSpy 1M–2M	Est. revenue $8.9M–$24.0M net $16.2M–$36.9M gross	$49.99	19k reviews Very Positive	AnimeJRPG +6
Doki Doki Literature Club! 2017	Est. copies ≈ 7.7M–12.5M 5.2x vs typical SteamSpy 5M–10M	Est. revenue Free	Free	223k reviews Overwhelmingly Positive	Psychological HorrorVisual Novel +6