large companies who can afford the security infra to do those checks and store that data
There is no such company. This is just another way to ban “harmful” content. Verifying your identity and age to access restricted content is practically guaranteed to result in your identity being compromised within your lifetime.
It may or may not be a concern to you, but if you are hosting it from your home then people will be able to determine your IP and rough physical location.
If you’re on American cable internet and expecting a lot of traffic, your upload speed may become a problem.