You are talking about technology platforms. From a domestic perspective, no matter which industry, as long as the underlying technology platform is designed, there is basically no core technology developed by itself.
The technology platform is a complete and rigorous set of software products and related documents that serve the development of application software products. An excellent technology platform also includes a set of efficient underlying common codes, and even code generators, code security vulnerability checking tools, etc.
The technology platform effectively reduces the development costs of software companies. The quality of the technology platform directly reflects the quality of a software company's core competitiveness.
If the video conferencing platform you are talking about is based on software, it is a technology platform based on the popular cloud computing concept. There are Microsoft, Cisco webex, and citrix in foreign countries, but in China it is only full-time.
You have to note that the four companies I mentioned are all developed by themselves. When developing a platform, it will basically have many core patents of its own. In addition, most domestic video conferencing service providers are rented from foreigners, who have to pay a lot of money every year.
With this analysis, you should know the pros and cons of a truly good video conference.