The Web is not a broadcast medium. You are unlikely to encounter offensive material unless you go looking for it. But it should still be illegal to provide indecent material to children. Aside from parental blocking, there is no control over what children may see. Indecency is usually judged according to community standards.
Community standards vary widely across the world.
You control the future of the Internet. You are an attractive demographic for advertisers, publishers, software producers, etc. Your choices as a consumer will determine how the Internet evolves. Search for alternatives that deserve your support. Your voice and your vote will be heard by our government.