I've worked with all three frameworks, but as a mostly single dev/engineer I very very much prefer Svelte because it lacks a lot of boilerplate that React has, and it's easier to think about than Vue's clunky way to write variables and functions. But I'm a "hacker type" and don't work in a large tech company. I haven't seen Svelte in any sort of "real tech companies", haven't seen it on job boards, and it doesn't see…
It's a case of "Nobody ever got fired for choosing X"[0]. No one would blame you for choosing React for a major project / new startup, but someone could definitely poke holes in choosing Svelte ("theres no package for X", "it doesn't scale", "we can't find devs that know it", etc.) 0 - https://www.quora.com/What-does-the-phrase-Nobody-ever-got-f...
Oh, I know people who would. Especially if that choice was made mechanically, without proper assessment of project requirements and framework strengths/weaknesses.