Huh - I thought the R50 was the "new SL1" type camera.... I wonder what the differences are
The R50 is probably best considered a replacement for the SL3/250D and
EOS M50/M50 Mark II. https://www.bhphotovideo.com/c/compare/Canon_M50_Mark_II_vs_Canon_R50_vs_Canon_Rebel_SL3/BHitems/1598385-REG_1748812-REG_1473087-REG
The R100 is more like a replacement for the Rebel T7/1500D/2000D and
EOS M200. The R100 is very basic, entry-level camera missing many of the features found on the models costing more. https://www.bhphotovideo.com/c/compare/Canon_M200_vs_Canon_R100_vs_Canon_Rebel_T7/BHitems/1508687-REG_1769090-REG_1461734-REG
Compare the R10 with the T8i/850D and the R7 with EOS 90D.
Canon is going to sell lots of R100s since it only costs $600 with the RF-S 18-45mm kit lens! Only smaller format Micro 4/3 cameras from Panasonic and Olympus are price competitive, and that's only because they've recently been deeply discounted. The closest APS-C camera is the Nikon Z30, which is $100 more with a 16-50mm kit lens and doesn't have a viewfinder.
However, Canon might have made a couple mistakes. While the R100 will be one of the most affordable stills
cameras, it will not appeal to vloggers due to its fixed LCD screen (Canon's M200 and the Nikon Z30 both have fully articulated Touch Screens). To get that feature, vloggers will need to step up to the $2000 more expensive R50. Even then, the kit lens is a problem. Vloggers shooting with APS-C want a lens that's at least 16mm wide.... which the RF-S 18-45mm isn't. I don't know why Canon didn't just adapt the EF-M 15-45mm they had for their older M-series mirrorless. That would have made more sense. (Especially since their "upgrade" kit lens, the RF-S 18-150mm, also starts at 18mm. Plus this RF-S lens appears to be more of an adaptation of the EF-M 18-150mm.)
Note: The EOS SL1/100D was very similar to the Rebel T5/1200D and T6/1300D that sold at the same time... all three are very basic cameras. The SL1 has relatively minor upgrades... A slightly higher resolution Touch Screen LCD, one generation newer processor and slightly higher ISO range were the bulk of it. https://cameradecision.com/compare/Canon-EOS-1200D-vs-Canon-EOS-100D
When the SL2/200D came out, it got significantly upgraded with a number of features added to separate it from the most entry-level models. It got a bump from 18MP to 24MP, a two generation newer processor that supported a faster frame rate as well as an expanded ISO range with higher usable ISO, longer battery life, a self-cleaning sensor, an articulated Touch Screen LCD and more. https://cameradecision.com/compare/Canon-EOS-Rebel-SL2-vs-Canon-EOS-100D
The SL3/250D is pretty similar to the short lived SL2. Most of the SL3's upgrades are video-related. https://cameradecision.com/compare/Canon-EOS-Rebel-SL3-vs-Canon-EOS-Rebel-SL2