Back in the very old days of email, running an email server was a serious challenge for many reasons, like the cost of hardware, the cost of software, the cost of bandwidth, the cost of support services, and the cost of securing email and fighting spam. At that time big tech recognized the opportunity to provide easy to use email services for small companies and small communities, and thus Google started Google apps, and Microsoft started selling Exchange in the form of software as a service.
Big tech have turned many public opinion leaders into cyber-refugees. Their ideas are considered risky, their content is considered in some type of violation to some type of rules, and their funding is being drained in spite of the backers will. This wave of censorship was not the first, and it will not be the last. I have previously explained how this type of censorship is being monetized, and I think a complete echo system is now being setup so that anybody can be censored risk-free to the censors.
There are many alternative search engines, here is a short list with some comments from my experience: