You're avoiding my question.

I really don't agree with your argument that caring about user security and privacy would have a substantial effect on development time, certainly not in respect of GDPR.

If that's not true, we should be able to see an alternative to Zoom on the marketplace right now with as wide adoption as Zoom.

The fact we don't indicates there may be some reason security and privacy take a back-seat to usability and market adoption (and, in fact, it appears we've seen that pattern over and over again). "Engineering for security and privacy slows down product-to-market" is, admittedly, but one hypothesis.

Erm... there are plenty of video conferencing alternatives - video conferencing isn't something new that started with coronavirus.

There are, but I'm referring to one that has the penetration, adoption, and feature-set of Zoom that also has tight security and privacy guarantees.

I can't name one.