i don't think it's a trend as much as it is more socially acceptable - more and more trans people are coming out, which makes it seem like it's becoming popular when in reality we've just been hiding in the shadows
but i've heard of a couple of cases of people pretending to be trans, which is probably down to their own misinterpretations, and i've also heard a lot of debates on whether it's possible to be trans without dysphoria (despite the fact that if you have no gender dysphoria whatsoever, then that means you're fine with your assigned gender, which definitely isn't trans!). a term i have been hearing a lot tho is 'transtrender', which means somebody who 'acts trans' because it's trendy. personally, i think that while there are people who do think of transness as a fashionable thing, i think it's unfair that the term is commonly linked to people who are questioning their gender and experimenting with hormones. just my two cents