Personally, I don't have any huge problem with that, I think it makes sense to protect workers at both Ruth's Chris Steak House and a local family-run steak shop, and we should fund the program at the levels necessary to do that.
But I keep hearing the word loophole, including from Congress members. It is not that. This was by design, and it wasn't buried in some dense text. It was an unambiguous exemption in a two page rule. [1]
[1] It may not be perfectly clear to the average reader, but it certainly was clear for the rulemakers at Treasury.
"Waiver. The affiliation rules described above are waived for (1) any business concern with not more than 500 employees that, as of the date on which the loan is disbursed, is assigned a North American Industry Classification System code beginning with 72;"
Businesses with an industry classification code beginning with 72 include all restaurants and hotels.
https://www.sba.gov/document/support--affiliation-rules-payc...