A great time to expand your offerings is when there's an adjacent offering that's producing outsized returns for someone else, is easily replicable, and which you have an asymmetric advantage on.
I think everyone knows that when someone says "it's trivial" for a business to do something, it doesn't mean it's actually trivial. Doing anything of any value anywhere is non-trivial. It's shorthand for "doing Activity X is almost certainly achievable with an acceptable outlay of risk for Business Y."
This is absolutely not true, and proof that you completely misunderstood what I said.
You took an upmarket B2B infrastructure company and compared it to a low-end B2B/B2C software company. That is a completely different type of business.
Cloudflare launches new products and offerings all the time - and all B2B within their market space. The difference is that if they did what you suggest (make a Lovable), it would put them in a position of competing with their own customers, and it would have a chilling effect on selling more infrastructure to other companies who would then fear competition as well. It's not that they can't do it. It's that it is not wise for them to do so, and it's a different type of business entirely.
Cloudflare has already started releasing products that point in this direction. Not sure how far they will (or should) go, but it's really not categorically ridiculous or impossible or nonsensical, as you're implying.