Why did steinberg blocked vst2?

why now you cant use vst2?

What Operating system are you using? MacOS?

In that case run Cubase in Rosetta mode.

VST 2 Discontinued – Steinberg Support

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…and from the page linked by @JuergenP

As it stands, Steinberg hosts continue to offer VST 2 compatibility. Users of Mac computers with Apple silicon can continue to use VST 2 plug-ins under Rosetta 2.