There are many reasons why they are doing swap it could be that they are transferring to a new chain, or they are changing the contract, that is why you should always follow the update and do not leave their group channel in case there is an announcement of swap, more so if you are holding a big amount of token that is about to swap, the developer should be considerate in accepting late swap.
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In the least, for a few days every year, they should re-open the swap window.  But many ethical tokens have perpetual swaps.  It isn't that difficult.  People are simply stealing because they can get away with it.  They have no integrity and are scumbags.