it may a thing or speculative who knows ?
though you are right that mostly in CHristmas there is a increase but this is not constant as there are some years that even December brings the market a failed expectation .
Ahead of Christmas and the new year, the crypto market is a little excited. The holidays make the cryptocurrency movement a little better, The experience of the past few years will be repeated at the end of this year. 2021 has been a beautiful year for cryptocurrency, will further strengthen speculation about the year-end hype. I think the cryptocurrency market still looks positive, the trend will show good performance until the end of January.
but there are FUD recently and that affect the whole market.