The community has created lots of fun formats, but these formats are much more appealing to die hard fans than newcomers. Alt format tournaments happen in person at most once or twice a year in a given city. Constructing a new deck using new rules for a once a year tournament is fun for die hard players who are bored of the current metagame, but it’s just extra work for a newcomer.
For an alt format to actually bring in newcomers, it would have to be officially supported by FFG and happen about once a month. I suggested something like that here: Making Netrunner work for infrequent / lapsed players