This is less like being vegan and exactly like being Amish. The Amish, unlike what is usually believed, don't reject technology. They are very careful in adopting technology and seek to be deliberate about what technology to allow in their day to day life.
I think this deliberateness unavoidably leads to being a Luddite. The dominant force in human history is the continual development of new technology and it's integration into day to day human life, and human adaptation to that technology. We adapt to technology both quickly, via culture and training of children, and less quickly via genetic evolution.
Walking away from a technology that the vast majority of humanity embraces might be adaptive, both in terms of the individual and in terms of survival of the fittest, if that technology leads to the users becoming dramatically less fit. Rejecting the use of lead utensils is a great example of an adaptive rejection of a new technology.
Fine, you might rightly argue, this isn't about survival or evolution, it's about the quality of your life. It's hard to argue against that, and reasonable limits on the use of technology for children that can't regulate behavior to optimize their own health is certainly necessary. However, beyond that, abandoning technology in a more holistic way is no different than being Amish-lite. You are being deliberate about what technologies you accept into your day to day life, and this is admirable. However, it is also Amish-lite in that it is very likely to also be a form of freeloading.
The Amish are very much freeloading on their host society. They do not contribute to defense, nor do they utilize resources they control efficiently. Without the efficient utilization of resources of their host society, which allows for such things as large standing armies and fighter jets, they would have long ago been killed or displaced and their land taken. Rejection of Tik-Tok seems very unlikely to lead to any significant freeloading, but rejection of something like 'owning a cell phone' certainly does. As the rest of the world adapts it's culture and day to day life to what having a small pocket computer networked to every other computer unlocks, dramatic new ways of doing things will be unlocked, and new efficiencies will be found which will enrich everyone, including to some extent the Luddites, who are not participating in it. If there are enough of them, old ways of doing things will be maintained to profit from them, whereas if they participated the old ways of doing things (for example calling a phone number to order a pizza, and many more things, and things we haven't anticipated yet) could fall by the wayside.
Certainly you have a right to be a digital Luddite, but I don't believe there is any reason to think that this will give you a better outcome, by any measure, than just participating in the societal evolution would, and if done in a large scale way it is just being Amish with a different default threshold date for acceptable technologies.