No Altcoin should be kept in long-term wallets. We have seen the clearest examples of this in the past. People invest their money in the coins they trust very much, and they can't even get half of that money after years. You have to be careful.
Yeah anyone must be careful when investing in the new tokens or altcoins. There are so many projects that can become a trap for us. The problem is sometime people didn't know whether the developers can be trusted or not. They are always believing with what they have invested and they abandon the fact that if the developers behind their tokens were so shady.
They didn't know because maybe they didn't do their research, you know people are too hasty when profit is the topic and as usual, it will be too late to realize their mistakes because they have been scammed already. It's better to abandon the project if you suspect that it was shady before you lose more money in it.
There are still many fishes in the see so don't be too faithful with the earlier projects that you have invested with. Just to be clear I am only talking about new tokens and altcoins here. Old projects are of course must be our priority and they are the ones that we should be hodl for the long run. New tokens/alts can only be considered as playing a gambling. We can only try a few dollars on them.