Uhhhhh, Big Tech can and does also exist in Europe, Blaze. We need people switching to FOSS and non-profit software, but switching from American proprietary software to European proprietary software as a stopgap at least plausibly makes things somewhat better – owing to better regulations.
The alternative for Tw!ter is Mastodon. Bsky's business model is based on growth, it will be sold for billions to the highest bidder once there are sufficient subscribers locked in.
Still, it's run by a large American tech company and has a federation model that makes self-hosting and true decentralization somewhere between difficult and impossible.