I don't use any "smart home" devices. Don't need them, don't want them. I am perfectly physically capable and thankfully not so lazy that I can't bring myself to get up out of a chair and simply walk over to the appropriate location to turn on or off a room's light switch or to turn on or off the TV if the remote isn't handy, or adjust the thermostat, whatever....
As someone who is retired and on a fixed income, I choose to put my money into what I perceive offers more value, and "smart home" devices just aren't in that category.
As for my iPhones and iPads eavesdropping on me, since I live alone there really is not much conversation going in this household, so probably the only thing they might pick up on is the occasional muttered expletive if I drop or spill something. I don't play music with HomePods or such, so no opportunity for spying there, either.
A single family home and what a homeowner may choose to do in terms of audio/video recording inside or outside it is one thing. (Although there may be community-wide HOA policies and regulations around this,) In a multifamily dwelling, such as a rental apartment complex, a condominium complex or a co-op development, it is quite another. In my condominium complex Ring doorbells and any sort of video or audio recording devices are not permitted on or around our front doors, our siding glass doors, our decks or windows, and/or positioned anywhere on the exterior of the building. Owners and residents may install and use security systems, though, since those aren't recording either by audio or visual means whatever is going on in or around the household or immediate vicinity of the property.
Someone can have a video camera recording footage from within his or her unit looking out their window(s) on the parking lot if they are concerned about their vehicle's safety and such, but they cannot place a camera outside their windows on the building's exterior. Use of these recording devices is considered violation of other property owners' / residents' and their visitors' privacy. We had a situation a couple of years ago where a tenant had set up one or more recording devices on his deck, which happened to be at boardwalk level, and so everyone who happened to be walking by on the boardwalk was picked up on video by his devices. That didn't go over well with a lot of residents here! There were also other issues with that tenant and to make a long, irrelevant story short, everyone was relieved when he moved out of this complex. The one good thing that did emerge from his temporary residence here was the realization that we residents and the condominium board of directors needed to be taking a good look at the whole issue of privacy and various electronic devices.
That said, yes, I have noticed that when I am on the computer (which I am most of the time, as opposed to an IOS device) and I happen to run a search on a topic which for whatever reason briefly catches my attention, it doesn't seem to take all that long before there are items related to that very topic popping up either in Google searches again or in social media sites I visit which are totally unrelated to whatever that topic might have been.
