Starting a new blockchain obviously has founder incentives which are great but it only makes sense when people feel like your contributing to the diversity of blockchains not simply copy pasting monero.
>A year ago, Platformer was the first to report that Signal was considering adding cryptocurrency payments to the platform, and it started with MobileCoin. Signal CEO Moxie Marlinspike has served as an adviser to the MobileCoin cryptocurrency, which is built on the Stellar blockchain and is designed to make payments as anonymous as cash.
If you're interested in monero in singal check this project https://ccs.getmonero.org/proposals/vd-molly-payments-stage1...
[1] We want payments in Signal to be fast, private, and work well on mobile devices. The first payments protocol we’ve added support for is a privacy focused payments network called MobileCoin, which has its own currency, MOB. https://signal.org/blog/help-us-test-payments-in-signal/
[2] https://messari.io/asset/mobilecoin/profile/launch-and-initi...
[3] https://www.theverge.com/22872133/signal-cryptocurrency-paym...