[mtremsal]

AFAICT Signal is collateral damage in this disinformation campaign. The original attack seems to be aimed at the CEO of NPR, coming from an assortment of right wing (and some Russian-aligned) voices. She happens to also be on the board of Signal which, through the prism of conspiracy theory, now extends their crusade. Given that Telegram is commonly understood to be aligned with the Russian government, this maps neatly on the US/left vs Russia/right axis through which such people already understand the world.