One piece of evidence: if you look at this Wikipedia list of megachurches, Baptist-affiliated (and especially Southern Baptist Convention-affiliated) churches are second only to so-called non-denominational:
https://en.wikipedia.org/wiki/List_of_megachurches_in_the_Un...Many of the others, including Calvary and many non-denominational ones, are largely derivative of Anabaptist theology--e.g. practice adult baptism. Pentacostalism originally drew most of its adherents from Baptist churches. Ancedotally, where I grew up people readily migrated between Baptist and Pentacostal churches. Interestingly, there was also a group of Catholic parishioners at my church who practiced--or I guess I should say experienced--speaking in tongues.
More to your point, famous televangelists like Billy Graham were Baptist. Oral Roberts identified as a Baptist early on, and went to a Baptist seminary school. Likewise for Pat Robertson. Baptists really seemed to dominate the scene during the latter part of the 20th century when the rise of the megachurches began, though they were preceded and succeeded by iconic personalities of different denominations. Nobody really remembers the ones that preceded them, like the Roman Catholic Bishop for whom the word televangelist was supposedly originally coined, exactly because the shift toward cults of personality hadn't become widespread.
I'm neither a scholar of theology nor sociology, but I don't think this is all coincidental.
Part of it is likely that the Second Great Awakening (https://en.wikipedia.org/wiki/Second_Great_Awakening) was largely dominated by Baptist and Methodist churches and especially charismatic (small 'c') pastors who at least nominally adhered to those theologies. IME, many modern American Methodist churches adhere to a significantly different theology than traditional Methodism, in many respects akin to Anabaptism. Methodism spread globally primarily through British colonies. IIRC, Methodism was the dominate Christian denomination in Singapore and Malaysia, and I'm pretty sure you could trace import of the Charismatic Movement into Singapore through the Methodist communities.
The critical element of Anabaptism isn't theological, per se, but the (lack of) institutional and community structures. Mennonites are Anabaptists but you don't find Mennonite megachurches or televangelists because the structures that Anabaptism removed were replaced with other communal structures. I do know a Mennonite who, with a Methodist spouse (whose father is a Methodist Bishop), attend an evangelical church--either Baptist-affiliated or non-denominational. It's a relatively easy transition from a religious perspective.