NPCI/RuPay is non-profit company.
NPCI's main objective is to help our PSU banks, Small banks to launch debit/credit cards, online apply option etc.
RuPay's main focus on Tier 2, Tier 3 cities and all other small cities, villages etc and also poor to middle class people.
RuPay help small startups, technology providers to grow.
For example - if you heard about Slice card. Before Slice Visa card. Slice was launched on RuPay network.
Initial days, NPCI/RuPay help slice for all technical assistance. Without help of NPCI/RuPay, Slice's valuation will not touch more than $1 billion.
Every year, NPCI help more than 1000s of small startups, service providers for all technical assistance.
Zeta is also one of them successful startups. Last time i heard, when RBI ban HDFC bank. HDFC bank give contract to Zeta -
https://the-ken.com/story/hdfc-rescue-mission-gives-wings-to-zetas-banking-tech-ambitions/
Recently, Mastercard also invest in Zeta.
M2P is another company. 80%-90% RuPay prepaid card payment service provide by M2P.
Due to this growth, recently Visa card also invest in Bengaluru-Based Fintech Startup M2P.
You may not aware about this 2 startup companies like "kiya ai" and "Mindgate Solutions (P) Limited".
This 2 statups recently got contract from NPCI, Union bank and PNB bank for Credit card linking with UPI and UPI Lite for other banks.
One day, im sure this companies will grow and Visa/mastercard also give contract to this companies and also invest money on this startups.
Moral of the story - SBI Cashback card will not launch on RuPay network because the purpose of NPCI/RuPay is not to earn money.
NPCI also run
https://nfinite.in/ program where startup companies get all technical assistance from NPCI and NPCI also help this startups to launch Visa/mastercard prepaid/credit cards because visa/mastercard also work under NPCI.
NPCI is umbrella organisation and all payments settlement in India is done through NPCI, doesn't matter you used visa/mastercard/Diners club or RuPay.
RuPay will definitely launch lots of super premium credit cards in future but its upto banks they want to promote or not and if RuPay is turn into for profit company then definitely banks and RuPay both will launch Ultra Premium credit cards on RuPay.