It's not true that there wouldn't be point in using teletext even if the same information is available over the web. First of all, the access to teletext is convenient if you just have the TV remote - browsing with so-called "smart TV's" is painful (bad UX) and switching to an actual computer involves changing TV input, and losing possibility to watch TV picture and hear the sound at the same time.
Lots of people here use teletext e.g. to check up sports results and latest news on headline level.
And, as someone pointed out, even the Web version of Text-TV pages is often good: it's snappy and fast even if you only have a 2G connection.
Sweden: http://www.svt.se/svttext/web/pages/100.html
Finland: http://www.yle.fi/tekstitv/txt/P100_01.html
Norway: https://nrk.no/tekst-tv/100/
Denmark: http://www.dr.dk/nav/tekstttv/indexx.htm
(These are the public broadcaster pages; commercial channels have their own, similar ones.)