You can, but it's a tiny minority of people on Twitter. When I load this page on Gab, literally every single recommended account is like this. A random sample of Twitter users will be basically the same as a random sample of Internet users and brands; a random sample of Gab users seems to be entirely alt-right, white supremacists and Nazis.
Of course people who tend to get deplatformed will tend to congregate on a platform where they don't. But Gab actively courts this userbase. See for example https://twitter.com/ClenchedFisk/status/1027690034718224384
Not to say that Gab isn't a cesspool, and Mr. Torba, when he shows up here, appears to be a rather unpleasant character, but Gab being full of bad people is a function not only of Gab being bad by definition, but also of bigger players' policies as well.
I'm not saying Andrew Torba shouldn't have built Gab; I am lamenting its existence, insofar as I don't want anyone to be a white supremacist. But white supremacists do exist, and as long as they do they'll make spaces for themselves, whether on Gab or 8chan or some dark corner of Twitter. All we can do is push those spaces as far away as possible.
And in any case I just am not sure if pushing undesirables (especially if it is undesirables only of a certain political bent, but not the others) into some dark corner is a good strategy. Both sides end up in even stronger filter bubbles, and banned people get good recruiting tools and feed theior persec ution complexes -- because the "lamestream media" and "libturds" actually are out to get them.