I haven't notice too many captchas from Linux myself... maybe about 50% more than Windows or Mac, but in general it hasn't been so bad. I do think that it could potentially get bad though.

I'm also not sure how this can/would shake out when you can just use tools like Playwright/Puppeteer to manage a real browser. Both Google and MS do this (not as much as bare crawlers) to handle SPA-like site content.