IIRC, there's 23 women that filed civil cases, one withdrawn. Another 2 who filed criminal complaints but not civil complaints. Reportedly 4 more women who are also going to be file suits but are working out who will represent them.
Then there are about 18 other women that Watson's team brought forward as masseuses he had worked with that they gave as character witnesses. Though one of those character witnesses had messaged other masseuses about Watson's reputation getting around and recommending not working with him.
That's 47 women (that we know of) in something like a year and a half or two year span (not entirely sure the timing of the 18 women working with him) that Watson had giving him massages. During a pandemic. When he had team-paid for masseuses available. That he reached out to on Instagram, the messages of which are hard evidence he actually had engagements with these women. Asking if they'd handle groin massages. Some of the women he approached for this not even being masseuses.
His lawyer has already admitted sexual contact taking place. At the very least, the evidence suggests he's probably been pursuing prostitution in the guise of massages on a massive scale.
It's very likely when he was pursuing women on Instagram for this, he's ended up with a lot of women who just do legitimate massage. It's not hard to believe he pushed for more during his sessions, is it? We've got 25 women who have alleged at some point he did, with 4 more still possibly to file. While there isn't likely video evidence of it taking place, IIRC there is evidence of some of the women being distraught with friends over what took place after their session with him.
So without us even having seen all of the evidence there is, I'd disagree with your contention this looks like just a money grab, and the evidence being flimsy. I'm sure there are some money-grabbers involved in the suit, probably some who knew what Watson was after and were willing to provide it, and now are cashing in once it's come to light what he was doing. But it seems extremely unlikely all 29 cases are due to that, and certainly not the women who filed criminal complaints but not civil actions.