Microsoft and Google both spend a lot on security to ensure due diligence. Of course there still can and will be issues.

But, the situation with Zoom is vastly different. It's obvious by now that Zoom took shortcuts and even worse, actively circumvents security features of the OS and actively leverages insecure encryption (e.g ECB mode). There have been plenty of other issues also and more to come as CitizenLab has already pointed out.

So, objectively speaking its okay and I wouldn't blame anyone for seeking alternative solutions.