Barrier 2: That I'm familiar with, tax codes are not friendly to employer-provided housing. ClickCo paying >$X/month to housing Wanda Worker-Bee, when $X/month more pay would let her pick her own as-good housing, is a losing move.

Barrier 3: If you're thinking of ClickCo building housing - talk to an MBA. At scale, housing developments are mammoth capital investments, for something unrelated to ClickCo's business, with (at best) multi-year lead times and very long asset life expectancies.

Barrier 4: If ClickCo wants to scale up, or down, or shift parts of its workforce to or from a location - any housing it has built is immovable, and very slow and difficult to scale.

(In general, "migrant labor housing" implies that the workers are paid very poorly. And willing to live in something more like a refugee camp.)