Zwift with 250€?

Hello, can anyone tell me if I can buy a Zwift setup for €250? Many videos only recommend very expensive exercise bikes and smart trainers that are compatible with Zwift. I have a mountain bike, an Apple Watch, and an iPad. I'd like to know if there's a very cheap setup for €250? It could…

Is a mechanical ergometer sufficient for Zwift?

I don't know anything about Zwift yet, but I've heard that you can use a standard mechanical ergometer with a speed sensor and an ANT+ dongle. Perhaps someone has experience and can tell me if you can use Zwift with this bike: https://www.ebay.de/itm/194360174467?mkcid=16&mkevt=1&mkrid=707-127634-2357-0&ssspo =Pp60V4xuS6e&sssrc=4429486&ssuid=31iafwvxsga&var=&widget_ver=artemis&media=WHATS_APP

Zwift Hub difference?

Can anyone tell me what the differences are between the two devices? https://eu.zwift.com/de/collections/smart-trainers/products/wahoo-kickr?variant=42781153722619 https://eu.zwift.com/de/collections/smart-trainers/products/wahoo-kickr-core-zwift-one?variant=45138017157371